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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-Q

CERTIFIED SHAREHOLDER REPORT OF REGISTERED
MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number 811-21043

Pioneer Municipal High Income Trust
(Exact name of registrant as specified in charter)

60 State Street, Boston, MA 02109
(Address of principal executive offices) (ZIP code)

Dorothy E. Bourassa, Pioneer Investment Management, Inc.,
60 State Street, Boston, MA 02109
(Name and address of agent for service)

Registrant's telephone number, including area code: (617) 742-7825

Date of fiscal year end: April 30

Date of reporting period: January 31, 2008

Form N-Q is to be used by management investment companies, other than small business investment companies 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 close of the first and third fiscal quarters, pursuant to Rule 30b1-5under the Investment Company Act of 1940 (17 CFR 270.30b-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 respond 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 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. ss. 3507.


ITEM 1. Schedule of Investments.

Pioneer Municipal High Income Trust
SCHEDULE OF INVESTMENTS 1/31/08 (unaudited)

Principal
Amount Value
 TAX EXEMPT OBLIGATIONS - 123.8% of Net Assets
 Alabama - 1.3%
1,500,000 Camden Alabama Industrial Development Board, $ 1,550,715
1,000,000 Huntsville-Redstone Village Special Care Facil 911,990
2,000,000 Huntsville-Redstone Village Special Care Facil 1,762,340
 $ 4,225,045
 Arizona - 5.4%

5,000,000 Apache County Industrial Development Authorit$ 4,930,050 5,000,000 Apache County Industrial Development Authority 4,906,450 7,000,000 (a)Downtown Phoenix Hotel Corp., RIB, 5.646%, 7/1 6,488,510

980,000 Pima County Industrial Development Authority, 1,031,107
500,000 Yavapai County Industrial Development Authorit 515,790
 $ 17,871,907
 California - 6.2%
5,150,000 + Golden State Tobacco Securitization Corp., 7.$ 6,369,108
7,000,000 + Golden State Tobacco Securitization Corp., 7.8 8,681,610
2,500,000 University of California Revenue, 5.0%, 5/15/2 2,572,950
5,000,000 Valley Health System Hospital Revenue, 6.5%, 5 2,925,000
 $ 20,548,668
 Connecticut - 1.5%
5,000,000 Mohegan Tribe Indians Gaming Authority, 6.25%$ 5,028,900

 Delaware - 0.4%
765,000 Sussex County Delaware Revenue, 5.9%, 1/1/26 $ 746,464
600,000 Sussex County Delaware Revenue, 6.0%, 1/1/35 569,340
 $ 1,315,804
 District of Columbia - 3.4%
5,000,000 District of Columbia Tobacco Settlement Finan$ 5,144,300
6,000,000 District of Columbia Tobacco Settlement Financ 6,130,920
 $ 11,275,220
 Florida - 2.9%
2,000,000 Beacon Lakes Community Development, 6.9%, 5/1$ 1,992,400
1,000,000 St. Johns County Industrial Development Author 904,550
2,000,000 St. Johns County Industrial Development Author 1,746,780
5,000,000 Tallahassee Health Facilities Revenue, 6.375%, 5,103,700
 $ 9,747,430
 Georgia - 2.9%
4,240,000 (a)Atlanta Georgia Water & Waste Revenue, RIB, 1$ 4,582,889
2,400,000 Fulton County Residential Care Facilities Reve 2,053,152
2,600,000 Fulton County Residential Care Facilities Reve 2,150,408
1,000,000 Rockdale County Development Authority Revenue, 980,220
 $ 9,766,669
 Guam - 1.4%
5,000,000 Northern Mariana Islands, 5.0%, 10/1/22 $ 4,735,700

 Idaho - 1.5%
5,000,000 Power County Industrial Development Corp., 6.$ 5,113,050

 Illinois - 6.0%
1,000,000 Centerpoint Intermodal Center, 8.0%, 6/15/23 $ 970,860
2,000,000 Chicago Illinois O'Hare International Airport 1,994,260
1,000,000 Illinois Finance Authority Revenue, 6.0%, 11/1 966,220
1,000,000 Illinois Finance Authority Revenue, 6.0%, 11/1 949,710
1,500,000 Illinois Health Facilities Authority Revenue, 1,334,580

16,880,000(b)Metropolitan Pier & Exposition Authority Dedic 11,976,529 1,800,000 Southwestern Illinois Development Authority Re 1,694,556 $ 19,886,715 Indiana - 3.0%
5,000,000 Indiana Health & Educational Facility Financi$ 4,787,350

1,000,000 Indiana State Development Finance Authority Re 1,004,920
4,300,000 Indiana State Development Finance Authority Re 4,334,873
 $ 10,127,143
 Louisiana - 1.5%
5,000,000 Louisiana Public Facilities Authority Revenue$ 5,029,550

 Maryland - 1.5%
5,000,000 Maryland State Health & Higher Educational Fa$ 4,933,000

 Massachusetts - 9.0%
3,000,000 Massachusetts Bay Transportation Authority, 5$ 3,336,300
7,050,000 Massachusetts Health & Educational Facilities 7,409,127
3,500,000 Massachusetts Health & Educational Facilities 3,639,580
5,000,000 Massachusetts Health & Educational Facilities 5,213,850
9,810,000 (a)Massachusetts State Development Finance Agency 10,541,335
 $ 30,140,192
 Michigan - 3.0%
950,000 Doctor Charles Drew Academy, 5.7%, 11/1/36 $ 834,869
1,700,000 Flint Michigan Hospital Building Authority Rev 1,656,531
1,500,000 John Tolfree Health System Corp., 6.0%, 9/15/2 1,515,420
2,000,000 Michigan State Hospital Finance Authority Reve 1,835,420
4,010,000 Michigan State Hospital Finance Authority Reve 4,012,085
7,720,000 Wayne Charter County Special Airport Facilitie -
 $ 9,854,325
 Minnesota - 2.2%
1,675,000 Duluth Economic Development Authority Health $ 1,750,810
1,500,000 North Oaks Senior Housing Revenue, 6.0%, 10/1/ 1,472,895
2,000,000 North Oaks Senior Housing Revenue, 6.125%, 10/ 1,981,840
2,000,000 North Oaks Senior Housing Revenue, 6.5%, 10/1/ 2,042,920
 $ 7,248,465
 Mississippi - 0.9%
3,000,000 Mississippi Business Finance Corp. Pollution $ 3,015,000

 Montana - 0.4%
1,600,000 Two Rivers Authority, Inc. Correctional Facil$ 1,175,920

 Nevada - 2.1%
1,000,000 Clark County Industrial Development Revenue, $ 1,045,010
4,600,000 Clark County Industrial Development Revenue, 5 4,247,134
2,000,000 Nevada State Department of Business & Industry 1,600,020
 $ 6,892,164
 New Hampshire - 0.9%
3,000,000 Manchester School Facilities Revenue, 5.125%,$ 3,089,970

 New Jersey - 10.1%
2,000,000 New Jersey Economic Development Authority Rev$ 1,932,620
13,350,000 New Jersey Economic Development Authority Reve 12,508,950
1,000,000 New Jersey Economic Development Authority Reve 958,990
6,150,000 New Jersey Economic Development Authority Reve 6,195,080

10,000,000 + Tobacco Settlement Financing Corp., 6.75%, 6/1 11,984,900 $ 33,580,540 New Mexico - 1.3%
1,500,000 Otero County New Mexico Project Revenue, 6.0%$ 1,455,015 2,960,000 Otero County New Mexico Project Revenue, 6.0%, 2,834,378 $ 4,289,393 New York - 12.4%
2,500,000 Albany New York Industrial Development Agency$ 2,463,500

2,000,000 Nassau County New York Industrial Development 2,034,600
2,000,000 New York City Industrial Development Agency, 5 2,003,640
12,990,000 New York City Industrial Development Agency, 6 12,721,367
5,000,000 New York City Trust Cultural Resources Revenue 5,113,300
7,040,000 (a)New York State Dormitory Authority Revenue, RI 8,691,373
2,000,000 Suffolk County Industrial Development Agency, 2,051,400
6,000,000 Triborough Bridge & Tunnel Authority Revenue, 6,282,720
 $ 41,361,900
 North Carolina - 2.5%

4,030,000 Charlotte North Carolina Special Facilities R$ 3,618,980 4,600,000 Charlotte North Carolina Special Facilities Re 4,729,214 $ 8,348,194

Oklahoma - 6.4%
3,000,000 + Oklahoma Development Finance Authority Revenu$ 3,183,600

8,000,000 + Oklahoma Development Finance Authority Revenue 8,489,600
4,100,000 Tulsa Municipal Airport Revenue, 5.65%, 12/1/3 4,078,024
1,225,000 Tulsa Municipal Airport Revenue, 6.25%, 6/1/20 1,186,057
4,350,000 Tulsa Municipal Airport Revenue, 7.35%, 12/1/1 4,352,567
 $ 21,289,848
 Pennsylvania - 6.8%

3,000,000 Allegheny County Hospital Development Authori$ 2,598,000 1,550,000 Allegheny County Hospital Development Authorit 1,550,046 12,300,000 + Allegheny County Hospital Development Authorit 14,733,309

1,000,000 Columbia County Hospital Authority Health Care 883,580
1,000,000 Hazleton Health Services Authority Hospital Re 985,960
1,280,000 Langhorne Manor Borough Higher Education & Hea 1,287,296
500,000 Pennsylvania Higher Educational Facilities Aut 503,270
 $ 22,541,461
 Rhode Island - 1.3%
4,000,000 Central Falls Detention Facilities Revenue, 7$ 4,267,120

 South Carolina - 2.1%
5,185,000 + South Carolina Jobs Economic Development Auth$ 6,114,567
665,000 + South Carolina Jobs Economic Development Autho 782,366
 $ 6,896,933
 Tennessee - 3.3%
7,000,000 Johnson City Health & Educational Facilities $ 8,530,200
2,480,000 Knox County Health Educational & Housing Facil 2,597,850
 $ 11,128,050
 Texas - 11.3%
1,345,000 Bexar County Housing Finance Corp., 8.0%, 12/$ 1,377,993
1,000,000 Dallas-Fort Worth International Airport Revenu 943,720
4,000,000 Decatur Hospital Authority Revenue, 7.0%, 9/1/ 4,140,000
1,000,000 + Georgetown Health Facilities Development Corp. 1,080,120
2,000,000 Gulf Coast Industrial Development Authority Re 1,880,100
3,750,000 Houston Airport System Special Facilities Reve 3,334,050
5,340,000 Lubbock Health Facilities Development Corp., 6 5,401,036
2,450,000 (a)Northside Independent School District, RIB, 10 2,740,374
500,000 Sabine River Authority Pollution Control Reven 469,020
7,040,000 (a)Texas State, RIB, 10.068%, 4/1/30 (144A) 7,875,789
1,365,000 (c)Willacy County Local Government Corp. Revenue, 1,392,901
1,500,000 Willacy County Local Government Corp. Revenue, 1,509,975
5,250,000 Willacy County Local Government Corp. Revenue, 5,403,720
 $ 37,548,798
 Utah - 0.2%
800,000 Spanish Fork City Charter School Revenue, 5.5$ 760,712

 Vermont - 0.5%
1,500,000 Vermont Educational & Health Buildings Financ$ 1,637,175

 Virginia - 0.3%
1,000,000 Peninsula Ports Authority, 6.0%, 4/1/33 $ 1,026,810

 Washington - 7.3%
4,710,000 Spokane Public Facilities District Hotel/Mote$ 5,124,574
7,025,000 Tobacco Settlement Authority Revenue, 6.625%, 7,170,839
14,315,000 Washington State General Obligation, 0.0%, 6/1 7,438,217
5,000,000 Washington State Housing Finance Committee Non 4,687,350
 $ 24,420,980
 Wisconsin - 0.6%
2,400,000 Aztalan Wisconsin Exempt Facilities Revenue, $ 2,138,376

 TOTAL TAX-EXEMPT OBLIGATIONS
 (Cost $384,745,017) $ 412,257,127

MUNICIPAL COLLATERALIZED DEBT OBLIGATION - 2.9% of Net Assets

10,000,000(d)Non-Profit Preferred Funding Trust I, Series $ 9,652,500

TOTAL MUNICIPAL COLLATERALIZED DEBT OBLIGATION

 (Cost $10,000,000) $ 9,652,500

Shares COMMON STOCK - 1.0% of Net Assets
184,048 Northwest Airlines Corp. $ 3,443,538

 TOTAL COMMON STOCK
 (Cost $6,612,756) $ 3,443,538

TAX-EXEMPT MONEY MARKET MUTUAL FUND - 1.3% of Net Assets

4,278,574 BlackRock Liquidity Funds MuniFund Portfolio $ 4,278,574

TOTAL TAX-EXEMPT MONEY MARKET MUTUAL FUND
(Cost $4,278,574) $ 4,278,574

TOTAL INVESTMENTS IN SECURITIES - 129.0%

(Cost $405,636,347) (e)(f) $ 429,631,739 OTHER ASSETS AND LIABILITIES - 1.3% $ 4,436,109 PREFERRED SHARES AT REDEMPTION VALUE, INCLUDING DIVIDENDS PAYABLE - (30.3)% $ -101,012,956 NET ASSETS APPLICABLE TO COMMON SHAREOWNERS -$ 333,054,892

 .
RIB Residual Interest Bonds

NR Security not rated by S&P or Moody's.

(144A) Security is exempt from registration under Rule 144A of the

Securities Act of 1933. Such
securities may be resold normally to qualified institutional buyers in a transaction exempt
from registration. At January 31, 2008 the value of these securities amounted to
$42,651,842 or 12.8% of net assets applicable to common shareowners.

+ Prerefunded bonds have been collateralized by U.S. Treasury securities or U.S. Government Agencies which are held in escrow to pay interest and principal on the tax exempt issue and to retire the bonds in full at the earliest refunding date.

(a) The interest rate is subject to change periodically and inversely based upon prevailing market rates. The interest rate shown is the rate at January 31, 2008.

(b) Debt obligation initially issued at one coupon which converts to a higher coupon at a specific date. The rate shown is the rate at January 31, 2008.

(c) Escrow to maturity.

(d) The interest rate is subject to change periodically. The interest rate shown is the rate at January 31, 2008.

(e) The concentration of investments by type of obligation/market sector is as follows:

Insured 13%
General Obligation 7
Revenue Bonds:
 Health Revenue 27
 Airport Revenue 12
 Tobacco Revenue 11
 Development Revenue 5
 Pollution Control Revenue 5
 Facilities Revenue 5
 Education Revenue 4
 Housing Revenue 3
 Power Revenue 3
 Other Revenue 2
 Transportation Revenue 1
 Gaming Revenue 1
 School District Revenue 1
 Utilities Revenue 0
 100%

(f) At January 31, 2008, the net unrealized gain on investments based on cost for federal income tax purposes of $403,825,220 was as follows:

Aggregate gross unrealized gain for all inves$ 36,777,359 there is an excess of value over tax cost

Aggregate gross unrealized loss for all invest (10,970,840) there is an excess of tax cost over value $ 25,806,519 Net unrealized gain

For financial reporting purposes net unrealized gain on investments was $23,995,392
and cost of investments aggregated $405,636,347.

ITEM 2. CONTROLS AND PROCEDURES.

(a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR 270.30a-3(c))) as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph, based on their evaluation of these controls and procedures required by Rule 30a-3(b) under the Act (17 CFR270.30a-3(b))) and Rule 13a-15(b) or 15d-15(b) under the Exchange Act (17 CFR240.13a-15(b) or 240.15d-15(b)).

The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report.

(b) Disclose any change in the registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR270.30a-3(d)) that occurred during the registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting.

There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting.

ITEM 3. EXHIBITS.

(a) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2).

Filed herewith.


SIGNATURES

[See General Instruction F]

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) Pioneer Municipal High Income Trust

By (Signature and Title)* /s/ John F. Cogan, Jr.
John F. Cogan, Jr, President

Date March 31, 2008

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 dates indicated.

By (Signature and Title)* /s/ John F. Cogan, Jr.
John F. Cogan, Jr., President

Date March 31, 2008



By (Signature and Title)* /s/ Vincent Nave
Vincent Nave, Treasurer

Date March 31, 2008

* Print the name and title of each signing officer under his or her signature.

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