Company: EVF
Filing Date: 2025-08-22
Form Type: DEF 14A
Source: 0001145443-25-000243
Chunk: 1

Company: Eaton Vance Senior Income Trust
Filing Date: 2025-08-22
Form: DEF 14A
Chunk 1
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 card and return it in the enclosed postage-paid envelope as soon as possible to ensure that your shares are represented at the Annual Meeting.

| Sincerely,             |
| /s/ Kenneth A. Topping |
| Kenneth A. Topping     |
| President              |

<div align='center'>YOUR VOTE IS IMPORTANT - PLEASE RETURN YOUR PROXY CARD PROMPTLY.</div>

It is important that your shares be represented at the Annual Meeting. Whether or not you plan to attend, you are requested to complete, date, sign and return the applicable enclosed proxy card as soon as possible. You may withdraw your proxy if you attend the Annual Meeting and desire to vote at the Annual Meeting.

<div align='center'>Eaton Vance Senior Income Trust

NOTICE OF ANNUAL MEETING OF SHAREHOLDERS</div>

Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting of Shareholders to be Held on Wednesday, October 8, 2025: The Notice of Annual Meeting of Shareholders, Proxy Statement, Proxy Card(s) and Shareholder Report are available on the Eaton Vance website at https://funds.eatonvance.com/closed-end-fund-and-term-trust-documents.php.

The Annual Meeting of Shareholders of Eaton Vance Senior Income Trust, a Massachusetts business trust (the “Fund”), will be held at the principal office of the Fund, One Post Office Square, Boston, Massachusetts 02109, on Wednesday, October 8, 2025 at 11:30 a.m. (Eastern Time) (the “Annual Meeting”), for the following purposes:

| (1) | To                                                                                                                                       
 elect Trustees of the Fund as outlined below:                                                                                            |                                                                                                                                |
|     | a.                                                                                                                                       | three                                                                                                                          
 Class III Trustees, Alan C. Bowser, George J. Gorman, and Marcus L. Smith, to be elected by the holders of the Fund’s Common   
 Shares and Auction Preferred Shares, voting together as a single class.                                                        |
|     | b.                                                                                                                                       | one                                                                                                                            
 Class III Trustee, Nancy Wiser Stefani, to be elected by the holders of the Fund’s Auction Preferred Shares, voting separately 
 as a single class.                                                                                                             |
| (2) | To                                                                                                                                       
 consider and act upon any other matters that may properly come before the Annual Meeting and any adjourned or postponed session thereof. |                                                                                                                                |

Any such vote FOR or AGAINST the proposal will also authorize the persons named as proxies to