Company: EVF
Filing Date: 2025-08-22
Form Type: DEF 14A
Source: 0001145443-25-000243
Chunk: 0

Company: Eaton Vance Senior Income Trust
Filing Date: 2025-08-22
Form: DEF 14A
Chunk 0
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<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

SCHEDULE 14A
(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT
SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934 (Amendment No. )</div>

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

| ☐ | Preliminary Proxy Statement                                                     |
| ☐ | Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☒ | Definitive Proxy Statement                                                      |
| ☐ | Definitive Additional Materials                                                 |
| ☐ | Soliciting Material Pursuant to Section 240.14a-12                              |

| Eaton Vance Senior Income Trust                  |
| (Name of Registrant as Specified in Its Charter) |

<div align='center'>(Name of Person(s) Filing Proxy Statement,
if Other Than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

| ☒ | No fee required                                                                                    |
| ☐ | Fee paid previously with preliminary materials                                                     |
| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11 |

Eaton Vance Senior Income Trust

August 22, 2025

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

One Post Office Square

Boston, Massachusetts 02109</div>

August 22, 2025

Dear Shareholder:

You are cordially invited to attend the Annual Meeting of Shareholders (the “Annual Meeting”) of Eaton Vance Senior Income Trust (the “Fund”), which 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).

At the Annual Meeting, you will be asked to consider the election of Trustees of the Fund. The enclosed proxy statement contains additional information.

I hope that you will be able to attend the Annual Meeting. Whether or not you plan to attend and regardless of the number of shares you own, it is important that your shares be represented. I urge you to complete, sign and date the applicable enclosed proxy