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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
    
FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act File Number: 811-21187

Registrant Name: PIMCO Municipal Income Fund III

Address of Principal Executive Offices: 1345 Avenue of the Americas New York, New York 10105

Name and Address of Agent for Service: Lawrence G. Altadonna – 1345 Avenue of the Americas New York, New York 10105

Registrant’s telephone number, including area code: 212-739-3371

Date of Fiscal Year End: September 30, 2007

Date of Reporting Period: December 31, 2006

Form N-Q is to be used by the registered management investment company, other than a small business investment company registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b 1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget (‘‘OMB’’) control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.




Item 1. Schedule of Investments

PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited) 


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*

MUNICIPAL BONDS & NOTES–96.7%

 

Alabama–1.1%

   
  Birmingham, GO, Ser. B (AMBAC),    
$  1,000 5.00%, 12/1/27 Aaa/AAA $    1,046,230
2,560 5.00%, 12/1/32 Aaa/AAA 2,671,514
5,000 Birmingham Baptist Medical Centers Special Care Facs. Financing
Auth. Rev., 5.00%, 11/15/30, Ser. A
Baa1/NR 5,132,950
1,500 Colbert Cnty., Northwest Health Care Auth., Health Care Facs.
Rev.,5.75%, 6/1/27
Baa3/NR 1,552,905
      10,403,599
 

Alaska–0.6%

   
  State Housing Finance Corp. Rev.,    
3,900 5.00%, 12/1/33, Ser. A Aaa/AAA 4,007,367
1,000 5.25%, 6/1/32, Ser. C (MBIA) Aaa/AAA 1,023,590
      5,030,957
 

Arizona–2.9%

   
2,200 Health Facs. Auth. John C. Lincoln Health Network Rev.,
7.00%, 12/1/25, (Pre-refunded @ $102, 12/1/10) (a)
NR/BBB 2,498,232
1,500 Maricopa Cnty. Pollution Control Corp., Pollution Control Rev.,
5.05%, 5/1/29 (AMBAC)
Aaa/AAA 1,574,670
  Salt River Project Agricultural Improvement & Power Dist. Rev.,
Ser A (h),
   
5,000 5.00%, 1/1/35 Aa1/AA 5,320,100
16,000 5.00%, 1/1/37 Aa1/AA 17,024,320
      26,417,322
 

Arkansas–0.1%

   
7,000 Arkansas Dev. Finance Auth. Rev., zero coupon, 7/1/46 (AMBAC) Aaa/AAA 1,119,860
 

California–6.3%

   
1,000 Alameda Public Financing Auth. Rev., 7.00%, 6/1/09 NR/NR 1,000,830
2,000 Chula Vista Community Facs. Dist., Special Tax, 5.25%, 9/1/30 NR/NR 2,041,560
  Golden State Tobacco Securitization Corp., Tobacco Settlement Rev,
Ser. 2003-A-1,
   
27,585 6.25%, 6/1/33 Baa3/BBB 30,863,477
21,000 6.75%, 6/1/39 Baa3/BBB 24,081,960
      57,987,827
 

Colorado–3.3%

   
1,000 Aurora Single Tree Metropolitan Dist., GO, 5.50%, 11/15/31 NR/NR 1,002,930
9,955 Colorado Springs, Utility Rev., 5.00%, 11/15/30, Ser. B (h) Aa2/AA 10,401,482
  El Paso Cnty., CP (AMBAC),    
1,735 5.00%, 12/1/23, Ser. A Aaa/AAA 1,828,239
1,725 5.00%, 12/1/23, Ser. B Aaa/AAA 1,817,701
2,820 5.00%, 12/1/27, Ser. A Aaa/AAA 2,957,898
1,500 5.00%, 12/1/27, Ser. B Aaa/AAA 1,573,350



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*
 

Colorado (continued)

   
$  1,500 Garfield Cnty. School Dist. Re-2, GO, 5.00%, 12/1/25 (FSA) Aaa/NR $    1,577,385
2,000 La Plata Cnty. School Dist. No. 9-R, Durango, GO, 5.25%, 11/1/25, (Pre-refunded @ $100, 11/1/12) (MBIA) (a) Aaa/NR 2,167,540
4,000 Saddle Rock Metropolitan Dist., GO, 5.35%, 12/1/31 (Radian) NR/AA 4,146,280
2,500 School Mines Auxiliary Facs. Rev., 5.00%, 12/1/37 (AMBAC) Aaa/AAA 2,602,275
      30,075,080
 

Florida–5.2%

   
3,480 Brevard Cnty. Health Facs. Auth. Rev., 5.00%, 4/1/34 A2/A 3,604,828
8,000 Highlands Cnty. Health Facs. Auth. Rev., Adventist Health System, 5.25%, 11/15/23, Ser. B, (Pre-refunded @ $100, 11/15/12) (a) A2/A+ 8,652,320
2,500 Hillsborough Cnty. Industrial Dev. Auth. Rev., Tampa General Hospital, 5.25%, 10/1/34, Ser. B A3/NR 2,636,050
1,485 Julington Creek Plantation Community Dev. Dist., Special Assessment Rev., 5.00%, 5/1/29 (MBIA) Aaa/AAA 1,565,487
1,000 Orange Cnty. Housing Finance Auth. Multifamily Rev., Palm Grove Gardens, 5.25%, 1/1/28, Ser. G Aaa/NR 1,038,470
15,000 Pinellas Cnty. Health Fac. Auth. Rev., Baycare Health, 5.50%, 11/15/33, (Pre-refunded @ $100, 5/15/13) (a) Aa3/NR 16,455,450
7,500 South Miami Health Facs. Auth., Hospital Rev., Baptist Health, 5.25%, 11/15/33 Aa3/AA− 7,868,925
5,615 Tampa, Water & Sewer Rev., 5.00%, 10/1/26, Ser. A Aa2/AA 5,885,474
      47,707,004
 

Georgia–0.7%

   
1,750 Fulton Cnty. Rev., 5.125%, 7/1/42, Ser. A NR/NR 1,705,602
4,000 Griffin Combined Public Utility Rev., 5.00%, 1/1/32 (AMBAC) Aaa/AAA 4,248,800
      5,954,402
 

Idaho–0.8%

   
  State Building Auth. Building Rev., Ser. A (XLCA),    
1,000 5.00%, 9/1/33 Aaa/AAA 1,047,380
5,750 5.00%, 9/1/43 Aaa/AAA 5,993,857
      7,041,237
 

Illinois–8.2%

   
2,250 Chicago, GO, 5.00%, 1/1/31, Ser. A (MBIA) Aaa/AAA 2,332,350
  Chicago, Lake Shore East, Special Assessment,    
1,600 6.625%, 12/1/22 NR/NR 1,737,392
3,456 6.75%, 12/1/32 NR/NR 3,757,882
5,000 Chicago Board of Education, GO, 5.00%, 12/1/31, Ser. C, (Pre-refunded @ $100, 12/1/11) (FSA) (a) Aaa/AAA 5,293,750
500 Chicago Board of Education School Reform, GO, zero coupon, 12/1/28,
Ser. A (FGIC)
Aaa/AAA 190,230
3,000 Chicago Kingsbury Redev. Project, Tax Allocation, 6.57%, 2/15/13,
Ser. A
NR/NR 3,088,620
7,000 Chicago Motor Fuel Tax Rev., 5.00%, 1/1/33, Ser. A (AMBAC) Aaa/AAA 7,295,120



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*
 

Illinois (continued)

   
$  4,000 Chicago Park Dist., GO, 5.00%, 1/1/29, Ser. D (FGIC) Aaa/AAA $    4,141,320
2,500 Chicago Water Rev., 5.00%, 11/1/31, (Pre-refunded @ $100, 11/1/11) (AMBAC) (a) Aaa/AAA 2,644,550
  Dev. Finance Auth. Rev.,    
10,898 People’s Gas, Light & Coke, 5.00%, 2/1/33 (AMBAC) (h) NR/NR 11,272,415
1,050 Three Crowns Park Plaza, 5.875%, 2/15/38 NR/NR 1,101,639
  Educational Facs. Auth. Rev., Univ. of Chicago,    
4,780 5.00%, 7/1/33 Aa1/AA 4,992,519
220 5.00%, 7/1/33, (Pre-refunded @ $100, 7/1/13) (a) Aa1/AA 236,108
165 5.25%, 7/1/41 Aa1/AA 174,573
4,160 5.25%, 7/1/41, (Pre-refunded @ $101, 7/1/11) (a) Aa1/AA 4,454,626
9,045 Metropolitan Pier & Exposition Auth., Dedicated State Tax Rev.,
McCormick Place Expansion, 5.25%, 6/15/42 (MBIA)
Aaa/AAA 9,611,398
4,300 Round Lake, Special Tax Rev., 6.70%, 3/1/33 NR/NR 4,684,205
2,935 Springfield Rev., 5.00%, 3/1/35 (MBIA) Aaa/AAA 3,107,255
1,175 State Health Facs. Auth. Rev., Elmhurst Memorial Healthcare,
5.50%, 1/1/22
A2/NR 1,250,059
3,050 Univ. Rev., 5.00%, 4/1/30, Ser. A (AMBAC) Aaa/AAA 3,148,485
      74,514,496
 

Indiana–2.9%

   
7,535 Bond Bank Rev., 5.00%, 2/1/33, Ser. A (FSA) Aaa/AAA 7,886,734
3,000 Brownsburg 1999 School Building Corp. Rev., 5.25%, 3/15/25, Ser. A, (Pre-refunded @ $100, 9/15/13) (FSA) (a) Aaa/AAA 3,279,030
1,375 Fort Wayne Pollution Control Rev., 6.20%, 10/15/25 Caa1/B− 1,409,306
5,000 Indianapolis Local Public Improvement Board, Tax Allocation, 5.00%, 2/1/29, Ser. G (MBIA) Aaa/AAA 5,228,700
  Michigan City Area Wide School Building Corp. Rev. (FGIC),    
2,500 zero coupon, 1/15/21 Aaa/AAA 1,368,725
1,000 zero coupon, 7/15/21 Aaa/AAA 535,860
1,000 zero coupon, 1/15/22 Aaa/AAA 522,940
1,000 Plainfield Parks Facs. Corp. Lease Rent Rev., 5.00%, 1/15/22 (AMBAC) Aaa/AAA 1,043,660
  Portage Industrial Economic Dev. Rev.,    
1,000 5.00%, 7/15/23 NR/BBB+ 1,025,140
775 5.00%, 1/15/27 NR/BBB+ 788,570
3,500 State Dev. Finance Auth. Pollution Control Rev., 5.00%, 3/1/30
(AMBAC)
Aaa/AAA 3,504,305
      26,592,970
 

Iowa–1.4%

   
1,000 Coralville, CP, 5.25%, 6/1/26, Ser. D NR/A2 1,059,330
1,000 Tobacco Settlement Auth., Tobacco Settlement Rev., 5.60%, 6/1/35, Ser. B, (Pre-refunded @ $101, 6/1/11) (a) Baa3/AAA 1,081,710
11,010 Tobacco Settlement Auth. of Iowa Rev., zero coupon, 6/1/34, Ser. B Baa3/BBB 11,063,839
      13,204,879



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*
 

Kentucky–0.3%

   
  Economic Dev. Finance Auth. Hospital Facs. Rev.,    
$  1,000 Catholic Healthcare Partners, 5.25%, 10/1/30 Aa3/AA− $    1,048,850
1,140 St. Luke’s Hospital, 6.00%, 10/1/19 A3/A 1,272,308
      2,321,158
 

Louisiana–0.8%

   
5,000 Public Facs. Auth. Rev., Ochsner Clinic Foundation, 5.50%,
5/15/32, Ser. B
A3/NR 5,279,400
1,595 Tobacco Settlement Financing Corp. Rev., 5.875%, 5/15/39,
Ser. 2001–B
Baa3/BBB 1,715,710
      6,995,110
 

Maryland–0.2%

   
  State Health & Higher Educational Facs. Auth. Rev.,    
1,500 Calvert Health Systems, 5.50%, 7/1/36 A2/NR 1,612,260
500 King Farm Presbyterian, 5.30%, 1/1/37 (c) NR/NR 496,060
      2,108,320
 

Massachusetts–2.7%

   
1,000 State Dev. Finance Agcy. Rev., 5.75%, 7/1/33, Ser. C Baa1/BBB+ 1,076,010
7,000 State Health & Educational Facs. Auth. Rev., Harvard Univ., 5.125%,
7/15/37, Ser. FF
Aaa/AAA 7,408,520
4,910 State Housing Finance Agcy., Housing Rev., 5.125%, 6/1/43, Ser. H Aa3/AA− 5,041,588
3,225 State Water Pollution Abatement Trust Rev., 5.00%, 8/1/32, Ser. 8 Aaa/AAA 3,379,703
7,555 State Water Res. Auth. Rev., 5.00%, 8/1/32, Ser. J (FSA) Aaa/AAA 7,875,257
      24,781,078
 

Michigan–12.8%

   
250 Crescent Academy, CP, 5.75%, 12/1/36 NR/NR 250,413
33,040 Detroit Sewer Rev., 5.00%, 7/1/32, Ser. A (FSA) (h) NR/NR 34,585,389
  Detroit Water Supply System (MBIA),    
28,912 5.00%, 7/1/34, Ser. A (h) Aaa/AAA 30,364,910
7,555 5.00%, 7/1/34, Ser. B Aaa/AAA 7,934,714
4,685 5.00%, 7/1/34, Ser. B, (Pre-refunded @ $100, 7/1/13) (a) Aaa/AAA 5,033,611
5,000 State Building Auth., Rev., 5.00%, 10/15/26, Ser. III, (Pre-refunded
@ $100, 10/15/12) (FSA) (a)
Aaa/AAA 5,343,250
  State Hospital Finance Auth. Rev.,    
175 Detroit Medical Center, 5.25%, 8/15/23 Ba3/BB− 168,238
4,000 Henry Ford Health System, 5.00%, 3/1/17, (Pre-refunded @ $100,
3/1/13) (a)
A1/A 4,272,480
  Oakwood Group, Ser. A,    
5,405 5.75%, 4/1/32 A2/A 5,765,676
575 6.00%, 4/1/22 A2/A 627,641
20,000 Trinity Health Credit, 5.375%, 12/1/30 Aa3/AA− 21,228,200
1,000 State Technical Univ., 5.00%, 10/1/33 (XLCA) Aaa/AAA 1,046,260
      116,620,782



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*
 

Minnesota–0.4%

   
$    750 Cottage Grove Rev., 5.00%, 12/1/31 NR/NR $      748,800
2,400 Upsala Independent School Dist. No. 487, GO, 5.00%, 2/1/28 (FGIC) Aaa/AAA 2,524,272
      3,273,072
 

Mississippi–0.5%

   
  Business Finance Corp., Pollution Control Rev.,    
3,000 5.875%, 4/1/22 Ba1/BBB− 3,007,080
1,250 5.90%, 5/1/22 Ba1/BBB− 1,253,838
      4,260,918
 

Missouri–2.5%

   
4,000 Bi-State Dev. Agcy. Rev., Missouri Illinois Metropolitan Dist., 5.00%, 10/1/32 (FSA) Aaa/AAA 4,212,320
1,350 St. Louis Cnty. Industrial Dev. Auth., Housing Dev. Rev., 5.20%, 1/20/36 (GNMA) NR/AAA 1,396,588
  St. Louis Industrial Dev. Auth. Rev. (GNMA),    
1,500 5.125%, 12/20/29 NR/AAA 1,556,850
1,500 5.125%, 12/20/30 NR/AAA 1,548,915
4,365 State Environmental Improvement & Energy Res. Auth., Water Pollution Control Rev., 5.00%, 7/1/23, Ser. B Aaa/NR 4,612,190
7,500 State Health & Educational Facs. Auth., Health Facs., St. Anthony’s Medical Center, 6.25%, 12/1/30, (Pre-refunded @ $101, 12/1/10) (a) A2/A 8,263,350
250 Township of Jennings Rev., 5.00%, 11/1/23 NR/NR 249,983
500 Univ. Place Transportation Dev. Dist., Special Assessment, 5.00%,
3/1/32
NR/NR 502,960
      22,343,156
 

Montana–1.3%

   
11,250 Forsyth Pollution Control Rev., Puget Sound Energy, 5.00%,
3/1/31 (AMBAC)
Aaa/AAA 11,893,500
 

Nevada–0.5%

   
3,355 Henderson Health Care Fac. Rev., Catholic Healthcare West,
5.125%, 7/1/28
A/A2 3,416,296
895 Henderson Local Improvement Dists., Special Assessment,
5.80%, 3/1/23
NR/NR 923,067
      4,339,363
 

New Hampshire–0.5%

   
  Manchester Water Works Rev. (FGIC),    
1,500 5.00%, 12/1/28 Aaa/AAA 1,585,065
3,250 5.00%, 12/1/34 Aaa/AAA 3,422,315
      5,007,380
 

New Jersey–3.8%

   
  Camden Cnty.,    
1,000 Improvement Auth., 5.00%, 2/15/35, Ser. A Baa3/BBB 1,028,150
1,540 Improvement Auth. Rev., Cooper Health System, 6.00%, 2/15/27, (Pre-refunded @ $102, 2/15/07) (a) Baa3/BBB 1,574,635



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*
 

New Jersey (continued)

   
  Economic Dev. Auth.,    
$  4,500 Kapkowski Rd. Landfill, 6.50%, 4/1/28 Baa3/NR $    5,496,345
300 Newark Airport, 7.00%, 10/1/14 Ba3/NR 305,583
  Health Care Facs. Financing Auth. Rev.,    
2,500 Middlesex Cnty. Pollution Control Auth. Rev., 5.75%, 9/15/32 Ba1/BBB− 2,659,200
3,000 Pascack Valley Hospital, 6.625%, 7/1/36 Ccc/B+ 3,297,540
2,000 Somerset Medical Center, 5.50%, 7/1/33 Baa3/NR 2,075,040
2,000 South Port Corp. Rev., 5.10%, 1/1/33 NR/A 2,091,020
1,500 State Educational Facs. Auth. Rev., 6.00%, 7/1/25, Ser. D NR/NR 1,642,215
  Tobacco Settlement Financing Corp. Rev.,    
525 6.00%, 6/1/37 Baa3/BBB 569,746
1,000 6.125%, 6/1/24 Baa3/BBB 1,083,190
230 6.125%, 6/1/42 Baa3/BBB 250,981
350 6.25%, 6/1/43 Baa3/BBB 390,554
10,750 6.75%, 6/1/39 Baa3/BBB 12,295,097
      34,759,296
 

New Mexico–0.1%

   
1,000 Farmington Pollution Control Rev., 5.80%, 4/1/22 Baa2/BBB 1,008,380
 

New York–4.9%

   
10,000 Metropolitan Transportation Auth. Rev., 5.25%, 11/15/32, Ser. B,
(Pre-refunded @ $100, 11/5/13) (a)
A2/A 10,950,600
  New York City Municipal Water Finance Auth., Water & Sewer
System Rev.,
   
5,000 5.00%, 6/15/35, Ser. C Aa2/AA+ 5,250,150
8,180 5.00%, 6/15/37, Ser. D (h) Aa2/AA+ 8,635,217
1,500 5.00%, 6/15/39, Ser. A Aa2/AA+ 1,574,070
  State Dormitory Auth. Rev.,    
11,590 Sloan-Kettering Center Memorial, 5.00%, 7/1/34, Ser. 1 Aa2/AA 12,085,241
3,800 State Personal Income Tax, 5.00%, 3/15/32, (Pre-refunded @ $100, 3/15/13) (a) Aa3/AAA 4,088,572
2,000 State Environmental Facs. Corp. Rev., 5.00%, 6/15/28 Aaa/AAA 2,114,960
      44,698,810
 

North Carolina–1.3%

   
2,000 Charlotte-Mecklenburg Hospital Auth., Healthcare System Rev., 5.00%, 1/15/33, Ser. A Aa3/AA 2,081,180
  Eastern Municipal Power Agcy., Power System Rev.,    
2,000 5.125%, 1/1/23, Ser. D Baa2/BBB 2,083,120
2,000 5.125%, 1/1/26, Ser. D Baa2/BBB 2,076,700
3,795 5.375%, 1/1/17, Ser. C Baa2/BBB 4,043,497
1,500 Medical Care Commission, Health Care Facs. Rev., Cleveland Cnty., 5.00%, 7/1/35 (AMBAC) Aaa/AAA 1,575,465
      11,859,962



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*
 

Ohio–1.4%

   
$  2,500 Lorain Cnty. Hospital Rev., Catholic Healthcare, 5.375%, 10/1/30 Aa3/AA− $    2,643,100
10,000 Ohio Air Quality Dev. Auth. Rev., 4.80%, 1/1/34 (FGIC) (h) Aaa/AAA 10,309,400
      12,952,500
 

Oklahoma–0.4%

   
3,500 Tulsa Cnty. Industrial Auth. Rev., Legacy Apartments, 4.90%, 11/20/46 (FHA-GNMA) Aaa/NR 3,635,520
 

Pennsylvania–2.9%

   
4,350 Allegheny Cnty. Hospital Dev. Auth. Rev., 9.25%, 11/15/30, Ser. B Ba3/B+ 5,172,324
1,500 Cumberland Cnty. Auth. Retirement Community Rev., Wesley Affiliated Services, 7.25%, 1/1/35, Ser. A, (Pre-refunded @ $101, 1/1/13) (a) NR/NR 1,789,620
3,250 Delaware River Joint Toll Bridge, Commission Bridge Rev.,
5.00%, 7/1/28
A2/A− 3,398,265
1,250 Harrisburg Auth. Rev., 6.00%, 9/1/36 (c) NR/NR 1,264,600
3,000 Lehigh Cnty. General Purpose Auth. Rev., St. Luke’s Bethlehem Hospital, 5.375%, 8/15/33 Baa1/BBB 3,157,320
5,000 Philadelphia School Dist., GO, 5.125%, 6/1/34, Ser. D (FGIC) Aaa/AAA 5,340,850
6,300 St. Mary Hospital Auth., Bucks Cnty. Rev., 5.00%, 12/1/28, (Pre-refunded @ $101, 6/1/08) (a) Aa2/NR 6,266,484
350 Washington Cnty. Redev. Auth. Rev., 5.45%, 7/1/35, Ser. A NR/NR 358,799
      26,748,262
 

Puerto Rico–0.3%

   
2,200 Electric Power Auth., Power Rev., 5.125%, 7/1/29, Ser. NN A3/BBB+ 2,322,254
 

South Carolina–1.6%

   
7,500 Florence Cnty. Rev., McLeod Regional Medical Center, 5.00%, 11/1/31,
Ser. A (FSA)
Aaa/AAA 7,932,075
6,700 Jobs Economic Dev. Auth. Rev., Bon Secours Health System,
5.625%, 11/15/30
A3/A− 7,116,204
      15,048,279
 

Tennessee–0.1%

   
1,250 Knox Cnty. Health Educational & Housing Facs., Board Hospital Facs. Rev., Catholic Healthcare Partners, 5.25%, 10/1/30 Aa3/AA− 1,313,662
 

Texas–13.4%

   
4,135 Canyon Independent School Dist., GO, 5.00%, 2/15/28, Ser. A
(PSF-GTD)
NR/AAA 4,316,072
2,500 Columbia & Brazoria Independent School Dist., GO, 5.00%, 8/1/29 (PSF-GTD) NR/AAA 2,615,250
1,300 Comal Cnty. Health Facs., McKenna Memorial Hospital Project Rev., 6.25%, 2/1/32 Baa3/BBB− 1,416,818
5,000 Crowley Independent School Dist., GO, 4.75%, 8/1/35 (PSF-GTD) (h) Aaa/NR 5,123,700
12,975 Dallas Area Rapid Transit Rev., 5.00%, 12/1/32, (Pre-refunded @
$100, 12/1/12) (FGIC) (a)(h)
NR/NR 13,554,027



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*
 

Texas (continued)

   
  Denton Independent School Dist., GO (PSF-GTD),    
$    255 zero coupon, 8/15/26 Aaa/AAA $      90,074
5,745 zero coupon, 8/15/26, (Pre-refunded @ $44.73, 8/15/12) (a) Aaa/AAA 2,069,924
255 zero coupon, 8/15/27 Aaa/AAA 84,826
5,745 zero coupon, 8/15/27, (Pre-refunded @ $42.17, 8/15/12) (a) Aaa/AAA 1,951,462
215 zero coupon, 8/15/28 Aaa/AAA 67,377
4,785 zero coupon, 8/15/28, (Pre-refunded @ $39.75, 8/15/12) (a) Aaa/AAA 1,532,109
255 zero coupon, 8/15/29 Aaa/AAA 75,271
5,745 zero coupon, 8/15/29, (Pre-refunded @ $37.46, 8/15/12) (a) Aaa/AAA 1,733,496
85 zero coupon, 8/15/30 Aaa/AAA 23,627
1,915 zero coupon, 8/15/30, (Pre-refunded @ $35.30, 8/15/12) (a) Aaa/AAA 544,454
340 zero coupon, 8/15/31 Aaa/AAA 88,981
7,660 zero coupon, 8/15/31, (Pre-refunded @ $33.25, 8/15/12) (a) Aaa/AAA 2,051,654
4,400 Harris Cnty., GO, 5.125%, 8/15/31, (Pre-refunded @ $100,
8/15/12) (a)
Aa1/AA+ 4,717,328
  Harris Cnty. Health Facs. Dev. Corp. Rev.,    
5,000 Christus Health, 5.375%, 7/1/29, Ser. A, (Pre-refunded @ $101, 7/1/09) (MBIA) (a) Aaa/AAA 5,248,100
2,750 St. Luke’s Episcopal Hospital, 5.375%, 2/15/26, Ser. A, (Pre-refunded @ $100, 8/15/11) (a) NR/AAA 2,946,020
19,500 Harris Cnty. Rev., 5.125%, 8/15/32 (FSA) Aaa/AAA 20,532,330
4,005 Houston, GO, 5.00%, 3/1/25 (MBIA) Aaa/AAA 4,165,160
5,000 Houston Water & Sewer System Rev., 5.00%, 12/1/30, Ser. A, (Pre-refunded @ $100, 12/1/12) (FSA) (a) Aaa/AAA 5,344,700
7,000 Judson Independent School Dist., GO, 5.00%, 2/1/30 (PSF-GTD) Aaa/NR 7,220,710
11,950 Mansfield Independent School Dist., GO, 5.00%, 2/15/28
(PSF-GTD) (h)
NR/NR 12,473,291
  Mesquite Independent School Dist. No. 1, GO, Ser. A (PSF-GTD),    
1,365 zero coupon, 8/15/16 NR/AAA 908,489
1,000 zero coupon, 8/15/18 NR/AAA 598,330
1,000 zero coupon, 8/15/19 NR/AAA 563,820
1,000 zero coupon, 8/15/20 NR/AAA 532,270
2,105 Northwest Harris Cnty. Municipal Utility Dist. No. 16, GO, 5.30%, 10/1/29 (Radian) NR/AA 2,178,359
4,000 State of Texas, GO, 4.75%, 4/1/36 Aa1/AA 4,089,840
  Univ. Rev. Ser. B,    
2,000 5.00%, 7/1/26, (Pre-refunded @ $100, 7/1/14) (a) Aaa/AAA 2,123,040
11,115 5.00%, 8/15/33 (h) Aaa/AAA 11,623,333
      122,604,242
 

Utah–0.7%

   
1,750 Cnty. of Weber, IHC Health Services Rev., 5.00%, 8/15/30 Aa1/AA+ 1,795,552
4,100 Salt Lake Cnty. Hospital Rev., IHC Health Services, 5.125%,
2/15/33 (AMBAC)
Aaa/AAA 4,288,067
750 Spanish Fork City Rev., 5.70%, 11/15/36 NR/NR 755,003
      6,838,622



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
  Credit Rating
(Moody’s/S&P)
Value*
 

Washington–9.7%

   
$6,375 Chelan Cnty. Public Utility Dist. Rev., 5.125%, 7/1/33, Ser. C (AMBAC) Aaa/AAA $    6,690,180
  King Cnty. Sewer Rev., Ser A (h),    
10,000 5.00%, 1/1/35 (FGIC) Aaa/AAA 10,473,525
15,000 5.00%, 1/1/35 (FSA) Aaa/AAA 15,562,650
18,134 Port Tacoma, GO, 5.00%, 12/1/33, (Pre-refunded @ $100, 12/1/13) (AMBAC) (a)(h) NR/NR 19,559,378
10,000 Seattle Drain & Wastewater Rev., GO, 5.00%, 7/1/32 (FGIC) (h) NR/NR 10,418,574
23,100 Tobacco Settlement Auth., Tobacco Settlement Rev., 6.50%, 6/1/26 Baa3/BBB 25,551,372
      88,255,679
 

Wisconsin–0.1%

   
560 Badger Tobacco Asset Securitization Corp. Rev., 6.00%, 6/1/17 Baa3/BBB 601,289
  Total Municipal Bonds & Notes (cost–$827,807,523)   882,640,227

VARIABLE RATE NOTES (b)(d)(e)–3.0%

 

Colorado–0.0%

   
—ˆ (i) Colorado Springs, 7.786%, 11/15/30, Ser. 457 Aa2/NR 6
 

Florida–0.3%

   
2,554 State Turnpike Auth., 7.22%, 7/1/31, Ser. 1450 NR/Aa2 2,949,998
 

Illinois–0.0%

   
295 Dev. Finance Auth. Rev., 5.896%, 2/1/33 (AMBAC) NR/NR 360,139
 

Michigan–0.1%

   
995 Detroit Water Supply System Rev., 5.844%, 1/1/11 (MBIA) NR/AAA 1,301,002
 

New York–1.8%

   
4,660 Liberty Dev. Corp. Rev., 9.80%, 10/1/35, Ser. 1451 NR/Aa3 8,333,012
6,000 State Dormitory Auth., Univ. & College Improvement. Rev., 8.43%, 3/15/35, Ser. 1216 NR/AAA 7,733,400
      16,066,412
 

Ohio–0.1%

   
1,075 Ohio Air Quality Dev. Auth., 7.35%, 1/1/34, Ser. 1223 (FGIC) Aaa/AAA 1,241,098
 

Texas–0.6%

   
453 Crowley Independent School Dist., GO, 6.49%, 8/1/35 (PSF-GTD) Aaa/NR 509,086
2,028 Denton Independent School Dist., GO, 8.32%, 8/15/33,
Ser. 951 (PSF-GTD)
Aaa/NR 2,412,684
—ˆ (i) Mansfield Independent School Dist., GO, 5.889%, 2/15/28 (PSF-GTD) NR/NR 10
2,000 Sabine River Auth. Rev., 5.20%, 5/1/28 Baa2/BBB− 2,089,060
      5,010,840
 

Washington–0.1%

   
590 Port Tacoma, GO, 5.810%, 12/1/33 (AMBAC) NR/NR 864,309
  Total Variable Rate Notes (cost–$24,173,757)   27,793,804



PIMCO Municipal Income Fund III  
Schedule of Investments
December 31, 2006 (unaudited)  (continued)


Principal
Amount
(000)
    Value*

U.S. TREASURY BILLS (f)–0.3%

$  2,920 4.80%-4.91%, 3/1/07-3/15/07 (cost–$2,892,217)   $    2,892,217
  Total Investments before options written (cost–$854,873,497)–100.0% 913,326,248

OPTIONS WRITTEN (g)–(0.0)%

Contracts      
 

Call Options–(0.0)%

   
310 U.S. Treasury Notes 10 yr. Futures, Chicago Board of Trade, strike price $110, expires 2/23/07 (premiums received–$129,774)   (24,219)
  Total Investments net of options written (cost–$854,743,723)–100.0% $ 913,302,029



Notes to Schedule of Investments:

Portfolio securities and other financial instruments for which market quotations are readily available are stated at market value. Portfolio securities and other financial instruments for which market quotations are not readily available or if a development/event occurs that may significantly impact the value of a security are fair-valued, in good faith, pursuant to guidelines established by the Board of Trustees. The Fund’s investments are valued daily using prices supplied by an independent pricing service or dealer quotations, or are valued at the last sale price on the exchange that is the primary market for such securities, or the quoted mean price for those securities for which the over-the-counter market is the primary market or for listed securities in which there were no sales. Independent pricing services use information provided by market makers or estimates of market values obtained from yield data relating to investments or securities with similar characteristics. Exchange traded options and futures are valued at the settlement price determined by the relevant exchange. Short-term securities maturing in 60 days or less are valued at amortized cost, if their original term to maturity was 60 days or less, or by amortizing their value on the 61st day prior to maturity, if the original term to maturity exceeded 60 days. The prices used by the Fund to value securities may differ from the value that would be realized if the securities were sold. The Fund’s net asset value is determined daily as of the close of regular trading (normally, 4:00 p.m. Eastern time) on the New York Stock Exchange (‘‘NYSE’’) on each day the NYSE is open for business.
(a)  Pre-refunded bonds are collateralized by U.S. Government or other eligible securities which are held in escrow and used to pay principal and interest and retire the bonds at the earliest refunding date (payment date) and/or whose interest rates vary with changes in a designated base rate (such as the prime interest rate).
(b)  144A Security – Security exempt from registration, under Rule 144A of the Securities Act of 1933. These securities may be resold in transactions exempt from registration, typically only to qualified institutional buyers. Unless otherwise indicated, these securities are not considered to be illiquid.
(c)  When-issued security. To be settled after December 31, 2006.
(d)  Inverse Floater – The interest rate shown bears an inverse relationship to the interest rate on another security or the value of an index.
(e)  Variable Rate Notes – instruments whose interest rates change on specified date (such as a coupon date or interest payment date) and/or whose interest rates vary with changes in a designated base rate (such as the prime interest rate). The interest rate disclosed reflects the rate in effect on December 31, 2006.
(f)  All or partial amount segregated as collateral for futures contracts and/or written options.
(g)  Non-income producing.
(h)  Residual Interest Bonds held in Trust – Represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund acquired the residual interest certificates. These securities serve as collateral in a financing transaction.
(i)  Less than $500.

Glossary:

AMBAC – insured by American Municipal Bond Assurance Corp.
CP – Certificates of Participation
FGIC – insured by Financial Guaranty Insurance Co.
FHA – insured by Federal Housing Administration
FSA – insured by Financial Security Assurance, Inc.
GNMA – insured by Government National Mortgage Association
GO – General Obligation Bond
GTD – Guaranteed
MBIA – insured by Municipal Bond Investors Assurance
NR – Not Rated
PSF – Public School Fund
Radian – insured by Radian Guaranty, Inc.
XLCA – insured by XL Capital Assurance




Other Investments:

(1)  Futures contracts outstanding at December 31, 2006:

Type Contracts Market
Value
(000)
Expiration
Date
Unrealized
Appreciation
(Depreciation)
Long: Financial Future Euro – 90 day 57
13,505
6/18/07
$ (44,275
)
  Financial Future Euro – 90 day 57
13,525
9/17/07
(25,538
)
  Financial Future Euro – 90 day 57
13,545
12/17/07
(7,013
)
  Financial Future Euro – 90 day 57
13,553
3/17/08
2,963
  U.S. Treasury Notes 5 yr. Futures 992
104,222
3/30/07
(540,890
)
Short: U.S. Treasury Bond Futures (2,222
)
(247,614
)
3/21/07
4,605,312
  U.S. Treasury Notes 10 yr. Futures (190
)
(20,419
)
3/21/07
270,156
     
 
 
$ 4,260,715
(2)  Transactions in options written for the period ended December 31, 2006:

  Contracts Premiums
Options outstanding, September 30, 2006 484
$ 89,177
Options written 310
129,774
Options expired (484
)
(89,177
)
Options outstanding, December 31, 2006 310
$ 129,774



Item 2.    Controls and Procedures

(a) The registrant’s President and Chief Executive Officer and Principal Financial Officer have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a-2(c) under the Investment Company Act of 1940, as amended are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this document.

Prior to reaching this conclusion, the principal officers had become aware of matters relating to the Registrant’s participation in certain inverse floater structures that required enhancements to certain controls. The Registrant’s management determined that controls relating to the review and analysis of relevant terms and conditions of certain transfers of securities under the provisions of Statement of Financial Accounting Standards No. 140 ‘‘Accounting for Transfers and Servicing of Financial Assets and Extinguishments of Liabilities’’ (‘‘SFAS 140’’) were not effective.

The Registrant’s Management is taking such further actions as are necessary to revise its disclosure controls and procedures in order to increase the effectiveness of these controls with respect to the accounting treatment of transfers of certain inverse floater transactions. However, as discussed above, subsequent to December 31, 2006, the registrant enhanced controls related to the accounting treatment of transfers of certain inverse floater transactions.

(b) There were no significant changes in the registrant’s internal controls or in factors that could affect these controls subsequent to the date of their evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.

Item 3.    Exhibits

(a) Exhibit 99.302 Cert. – Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002




SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Registrant: PIMCO Municipal Income Fund III
By /s/ Brian S. Shlissel
President & Chief Executive Officer

Date: March 1, 2007

By /s/ Lawrence G. Altadonna
Treasurer, Principal Financial & Accounting Officer

Date: March 1, 2007

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dated indicated.

By /s/ Brian S. Shlissel
President & Chief Executive Officer

Date: March 1, 2007

By /s/ Lawrence G. Altadonna
Treasurer, Principal Financial & Accounting Officer

Date: March 1, 2007