Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0104
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
  WELLS FARGO & COMPANY/MN
 2. Date of Event Requiring Statement (Month/Day/Year)
02/09/2018		 3. Issuer Name and Ticker or Trading Symbol
PIONEER MUNICIPAL HIGH INCOME TRUST [MHI]
(Last)
(First)
(Middle)
420 MONTGOMERY STREET		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SAN FRANCISCO, CA 94104		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Variable Rate MuniFund Term Preferred Shares, Series 2021 1,250 (1)
I (2)
By Subsidiary (2) (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
WELLS FARGO & COMPANY/MN
420 MONTGOMERY STREET
SAN FRANCISCO, CA 94104		     X    
WFC HOLDINGS CORP
420 MONTGOMERY STREET
SAN FRANCISCO, CA 94104		     X    
Wells Fargo Municipal Capital Strategies, LLC
375 PARK AVENUE
NEW YORK, NY 10152		     X    

Signatures

WELLS FARGO & COMPANY, /s/ Lori Ward 02/16/2018
**Signature of Reporting Person Date
WELLS FARGO MUNICIPAL CAPITAL STRATEGIES, LLC, /s/ Adam Joseph 02/16/2018
**Signature of Reporting Person Date
WFC HOLDINGS, LLC, /s/ Arthur C. Evans 02/16/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The Variable Rate MuniFund Term Preferred Shares, Series 2021 ("Shares") reported in Table I represent Shares of which 1,125 Shares are beneficially owned by Wells Fargo Municipal Capital Strategies, LLC ("Capital Strategies") and 125 Shares are beneficially owned by WFC Holdings, LLC (WFC Holdings). Capital Strategies and WFC Holdings are wholly owned subsidiaries of Wells Fargo & Company ("Wells Fargo").
(2) This statement is jointly filed by Wells Fargo, Capital Strategies, and WFC Holdings. Wells Fargo holds an indirect interest in the Shares listed in Table I by virtue of its indirect ownership of its subsidiaries, Capital Strategies and WFC Holdings.
(3) Each reporting person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Section 13(d) of the US Securities Exchange Act of 1934 or any other purpose, (i) acting (or has agreed or is agreeing to act together with any other person) as a partnership, limited partnership, syndicate, or other group for the purpose of acquiring, holding or disposing of securities of the Issuer or otherwise with respect to the Issuer or any securities of the Issuer or (ii) a member of any group with respect to the Issuer or any securities of the Issuer.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.