Company: EVF
Filing Date: 2025-05-01
Form Type: 424B3
Source: 0001076598-25-000099
Chunk: 20

Company: Eaton Vance Senior Income Trust
Filing Date: 2025-05-01
Form: 424B3
Chunk 20
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 designed to decrease the possibility of conflicts
of interest between an investment adviser and its clients. In some cases, transactions may be permitted subject to fulfillment of certain
conditions. Certain other transactions may be prohibited. In addition, the Adviser has instituted policies and procedures designed to
prevent conflicts of interest from arising and, when they do arise, to ensure that it effects transactions for clients in a manner that
is consistent with its fiduciary duty to its clients and in accordance with applicable law. The Adviser seeks to ensure that potential
or actual conflicts of interest are appropriately resolved taking into consideration the overriding best interests of the client.

3. The following replaces the Appendix – “Eaton Vance Funds Proxy Voting Policy and Procedures”:

Adopted: June 16, 2003
Revised: May 8, 2013;
December 10, 2019;
October 12, 2021
April 2025

<div align='center'>Eaton Vance Funds

Proxy Voting Policy and Procedures</div>

I. Overview

The Boards of Trustees (the “Board”) of the Eaton Vance
Funds1 have adopted these written proxy voting policy and procedures
(the “Policy”). For purposes of this Policy:

| · | “Fund” means each registered investment company sponsored by the Eaton Vance organization; and |

| · | “Adviser” means the investment adviser or sub-adviser responsible for the day-to-day management of all or a portion of 
 the Fund’s assets.                                                                                                     |

II. Delegation of Proxy
Voting Responsibilities

The Board hereby delegates to the Adviser responsibility for voting
the Fund’s proxies as described in this Policy. In this connection, the Adviser is required to provide the Board with a copy of
its proxy voting policies and procedures (“Adviser Procedures”) and all Fund proxies will be voted in accordance with the
Adviser Procedures. The Adviser Procedures shall comply with Rule 206(4)-6 under the Investment Advisers Act of 1940, as amended (the
“Advisers Act”) and be reasonably designed to ensure that the Adviser votes Fund securities in the best interest of the Fund
and include how the Adviser addresses material conflicts that may arise between the interest of the Adviser and the interests of the Fund.

The Adviser is required to report any material change to the Adviser
Procedures to the Board in the manner set forth in Section V below.

III. Delegation of Proxy
Voting Disclosure