<SEC-DOCUMENT>0000940394-22-001532.txt : 20221222
<SEC-HEADER>0000940394-22-001532.hdr.sgml : 20221222
<ACCEPTANCE-DATETIME>20221222090920
ACCESSION NUMBER:		0000940394-22-001532
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20221222
DATE AS OF CHANGE:		20221222

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EATON VANCE SENIOR INCOME TRUST
		CENTRAL INDEX KEY:			0001070732
		IRS NUMBER:				043435040

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-263033
		FILM NUMBER:		221480108

	BUSINESS ADDRESS:	
		STREET 1:		TWO INTERNATIONAL PLACE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		617-482-8260

	MAIL ADDRESS:	
		STREET 1:		TWO INTERNATIONAL PLACE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>evfsupps.htm
<DESCRIPTION>EATON VANCE SENIOR INCOME TRUST PRO AND SAI SUPPLEMENTS DTD 12-22-2022
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<P STYLE="font: 10pt NewsGoth Dm BT; margin: 0 9pt 0 0; text-align: center">&nbsp;</P>

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<P STYLE="font: 10pt NewsGoth Dm BT; margin: 0 9pt 0 0; text-align: center">EATON VANCE SENIOR INCOME TRUST</P>

<P STYLE="font: 10pt NewsGoth Dm BT; margin: 0 9pt 0 0; text-align: center">Supplement to Prospectus dated August 25, 2022</P>

<P STYLE="font: 10pt NewsGoth Dm BT,sans-serif; margin: 6pt 0">&nbsp;</P>

<P STYLE="font: 10pt NewsGoth Dm BT,sans-serif; margin: 6pt 0 12pt">The following changes are effective March 31, 2023:</P>

<P STYLE="font: 10pt NewsGoth Dm BT,sans-serif; margin: 6pt 0 12pt">The following replaces the third paragraph under &#8220;Investment
Objective, Policies and Risks&#8221; in &#8220;Prospectus Summary&#8221; and the fifth paragraph under &#8220;The Adviser&#8221; in &#8220;Management
of the Trust&#8221;:</P>

<P STYLE="font: 10pt NewsGoth Lt BT; margin: 6pt 0 6pt 22.5pt">Sarah A. Choi, Catherine C. McDermott, Daniel P. McElaney and Andrew N.
Sveen are portfolio managers of the Trust. Messrs. McElaney and Sveen and Ms. McDermott are Vice Presidents of Eaton Vance and have been
portfolio managers of the Trust since March 2019. Ms. Choi is a Vice President of Eaton Vance and has been a portfolio manager of the
Trust since July 2022. Messrs. McElaney and Sveen and Ms. McDermott have been employed by Eaton Vance for more than five years and manage
other Eaton Vance funds. Ms. Choi has been employed by Eaton Vance since October 2019 and manages other Eaton Vance funds. Prior to joining
Eaton Vance, Ms. Choi worked as a Senior Credit Analyst at Apex Credit Partners from 2014 to 2019.</P>

<P STYLE="font: 10pt NewsGoth Lt BT; margin: 6pt 0 6pt 22.5pt">&nbsp;</P>

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    <TD STYLE="width: 49%; padding-top: 6pt; padding-bottom: 3pt; font: 10pt NewsGoth Dm BT">December 22, 2022</TD>
    <TD STYLE="width: 51%; padding-top: 6pt; padding-bottom: 3pt; font: 10pt NewsGoth Dm BT; text-align: right">&nbsp;</TD></TR>
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<P STYLE="font: 10pt NewsGoth Lt BT; margin: 6pt 0 6pt 22.5pt">&nbsp;</P>


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<P STYLE="font: 10pt NewsGoth Dm BT; margin: 0 9pt 0 0; text-align: center">EATON VANCE SENIOR INCOME TRUST</P>

<P STYLE="font: 10pt NewsGoth Dm BT; margin: 0 9pt 0 0; text-align: center">Supplement to Statement of Additional Information dated August
25, 2022</P>

<P STYLE="font: 10pt NewsGoth Dm BT,sans-serif; margin: 6pt 0">&nbsp;</P>

<P STYLE="font: 10pt NewsGoth Dm BT,sans-serif; margin: 6pt 0 12pt">The following changes are effective March 31, 2023:</P>

<P STYLE="font: 10pt NewsGoth Dm BT,sans-serif; margin: 6pt 0 12pt">The following replaces the tables under &#8220;Portfolio Managers.&#8221;
in &#8220;Investment Advisory and Other Services&#8221;:</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="width: 80%; font: 9pt NewsGoth XCn BT; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 33%; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="width: 12%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Number of<BR>
All Accounts</TD>
    <TD STYLE="width: 15%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Total Assets of<BR>
All Accounts</TD>
    <TD STYLE="width: 19%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Number of Accounts<BR>
Paying a Performance Fee</TD>
    <TD STYLE="width: 21%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Total Assets of Accounts<BR>
Paying a Performance Fee</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 13.7pt; line-height: 10pt">Sarah A. Choi<FONT STYLE="font-family: NewsGoth XCn BT,sans-serif"><SUP>(1)</SUP></FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Registered Investment Companies</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Pooled Investment Vehicles</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Accounts</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 13.7pt; line-height: 10pt">Catherine C. McDermott</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Registered Investment Companies</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">7</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$4,327.4</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Pooled Investment Vehicles</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Accounts</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 13.7pt; line-height: 10pt">Daniel P. McElaney</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Registered Investment Companies</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">4</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$1,652.3</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Pooled Investment Vehicles</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Accounts</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 13.7pt; line-height: 10pt">Andrew N. Sveen<FONT STYLE="font-family: NewsGoth XCn BT,sans-serif"><SUP>(2)</SUP></FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Registered Investment Companies</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">12</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$42,159.0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Pooled Investment Vehicles</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Accounts</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  </TABLE>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 9pt/10pt NewsGoth XCn BT; margin-top: 3pt; margin-bottom: 3pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: NewsGoth XCn BT,sans-serif"><SUP>(1)</SUP></FONT></TD><TD>Ms. Choi became a portfolio manager effective July 1, 2022.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 9pt/10pt NewsGoth XCn BT; margin-top: 3pt; margin-bottom: 3pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: NewsGoth XCn BT,sans-serif"><SUP>(2)</SUP></FONT></TD><TD>This portfolio manager serves as portfolio manager of one or more registered investment companies that invests or may invest in one
or more underlying registered investment companies in the Eaton Vance family of funds or other pooled investment vehicles sponsored by
Eaton Vance. The underlying investment companies may be managed by this portfolio manager or another portfolio manager.</TD></TR></TABLE>

<P STYLE="font: 10pt NewsGoth Lt BT; margin: 6pt 0">The following table shows, as of the Trust&#8217;s most recent fiscal year end, the
dollar range of equity securities beneficially owned in the Trust by its portfolio manager(s) and in the Eaton Vance family of funds as
of December 31, 2021.</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="font: 9pt NewsGoth XCn BT; width: 80%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 32%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Portfolio Managers</TD>
    <TD STYLE="width: 32%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Dollar Range of Equity Securities<BR>
Beneficially Owned in the Trust</TD>
    <TD STYLE="width: 36%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Aggregate Dollar Range of Equity<BR>
Securities Beneficially Owned in<BR>
the Eaton Vance Family of Funds</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Sarah A. Choi<FONT STYLE="font-family: NewsGoth XCn BT,sans-serif"><SUP>(1)</SUP></FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">None</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$1 - $10,000</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Catherine C. McDermott</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">None</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Over $1,000,000</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Daniel P. McElaney</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">None</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$100,001 - $500,000</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Andrew N. Sveen</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">None</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$100,001 - $500,000</TD></TR>
  </TABLE>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 9pt/10pt NewsGoth XCn BT; margin-top: 3pt; margin-bottom: 3pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: NewsGoth XCn BT,sans-serif"><SUP>(1)</SUP></FONT></TD><TD>Ms. Choi became a portfolio manager effective July 1, 2022.</TD></TR></TABLE>

<P STYLE="font: 9pt/10pt NewsGoth XCn BT; margin: 3pt 0 3pt 0.25in; text-indent: -0.25in">&nbsp;</P>

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    <TD STYLE="width: 49%; padding-top: 6pt; padding-bottom: 3pt; font: 10pt NewsGoth Dm BT">December 22, 2022</TD>
    <TD STYLE="width: 51%; padding-top: 6pt; padding-bottom: 3pt; font: 10pt NewsGoth Dm BT; text-align: right">&nbsp;</TD></TR>
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<P STYLE="font: 10pt NewsGoth Lt BT; margin: 6pt 0 6pt 22.5pt">&nbsp;</P>

<P STYLE="font: 10pt NewsGoth Lt BT; margin: 6pt 0">&nbsp;</P>

<P STYLE="font: 10pt NewsGoth Lt BT; margin: 6pt 0 6pt 22.5pt">&nbsp;</P>


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