<SEC-DOCUMENT>0000940394-22-001182.txt : 20220701
<SEC-HEADER>0000940394-22-001182.hdr.sgml : 20220701
<ACCEPTANCE-DATETIME>20220701074135
ACCESSION NUMBER:		0000940394-22-001182
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20220701
DATE AS OF CHANGE:		20220701

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:	333-227968
		FILM NUMBER:		221059636

	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>sitsupp.htm
<DESCRIPTION>EATON VANCE SENIOR INCOME TRUST PRO AND SAI SUPPLEMENT DTD 7-1-22
<TEXT>
<HTML>
<HEAD>
<TITLE></TITLE>
</HEAD>
<BODY>


<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0 9pt 0 0; text-align: center"><B>EATON VANCE SENIOR INCOME TRUST</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0 9pt 0 0; text-align: center"><B>Supplement to Prospectus dated October 21,
2021</B></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 6pt">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 6pt 0"><B>1. The following replaces the fourth paragraph under &ldquo;Investment
Objectives, Policies and Risk&rdquo; in &ldquo;Prospectus Summary&rdquo; in the Prospectus<FONT STYLE="font-size: 11pt">:</FONT></B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0">Sarah A. Choi, Catherine C. McDermott, Daniel P. McElaney, John Redding
and Andrew N. Sveen are portfolio managers of the Trust. Mr. Redding is a Vice President of Eaton Vance and has been a portfolio manager
of the Trust since November 2001. 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, Redding and Sveen and Ms. McDermott have been employed by Eaton Vance for more than five years and manage
other Eaton Vance funds. <FONT STYLE="color: windowtext">Ms. Choi has </FONT>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 Arial, Helvetica, Sans-Serif; margin: 6pt 0"><B>2. The following replaces the fifth paragraph under &ldquo;The Adviser&rdquo;
in &ldquo;Management of the Trust&rdquo; in the Prospectus<FONT STYLE="font-size: 11pt">:</FONT></B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0">Sarah A. Choi, Catherine C. McDermott, Daniel P. McElaney, John Redding
and Andrew N. Sveen are portfolio managers of the Trust. Mr. Redding is a Vice President of Eaton Vance and has been a portfolio manager
of the Trust since November 2001. 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, Redding and Sveen and Ms. McDermott have been employed by Eaton Vance for more than five years and manage
other Eaton Vance funds. <FONT STYLE="color: windowtext">Ms. Choi has </FONT>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: 11pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 3pt 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 53%; padding-top: 6pt; padding-bottom: 3pt; font: 10pt NewsGoth Dm BT"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif">July 1, 2022</FONT></TD>
    <TD STYLE="width: 47%; padding-top: 6pt; padding-bottom: 3pt; text-align: right; font: 10pt NewsGoth Dm BT">&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 0">&nbsp;</P>


<!-- Field: Page; Sequence: 1 -->
    <DIV STYLE="margin-bottom: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <DIV STYLE="break-before: page; margin-top: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt/107% Arial, Helvetica, Sans-Serif; margin: 0 0 8pt">&nbsp;</P>

<P STYLE="font: 10pt/101% Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>EATON VANCE SENIOR INCOME TRUST</B></P>

<P STYLE="font: 10pt/101% Arial, Helvetica, Sans-Serif; margin: 0 0 0 14.1pt; text-align: center"><FONT STYLE="letter-spacing: -0.05pt"><B>Supplement
to Statement of Additional Information dated </B></FONT><B>October 21, 2021</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0.5pt 0 3pt">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0.5pt 0 3pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt NewsGoth Lt 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 Dm BT,sans-serif"><B>1.</B></FONT></TD><TD><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif"><B>The following is added to the first table under &ldquo;Portfolio Managers.&rdquo;
in &ldquo;Investment Advisory and Other Services&rdquo;:</B></FONT></TD></TR></TABLE>

<P STYLE="font: 9pt Arial, Helvetica, Sans-Serif; margin: 3pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 9pt NewsGoth XCn BT; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 31%; padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="width: 14%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Number of<BR>
All Accounts</FONT></TD>
    <TD STYLE="width: 15%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Total Assets of<BR>
All Accounts</FONT></TD>
    <TD STYLE="width: 20%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Number of Accounts<BR>
Paying a Performance Fee</FONT></TD>
    <TD STYLE="width: 20%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Total Assets of Accounts<BR>
Paying a Performance Fee</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 13.7pt; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Sarah A. Choi<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"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Registered Investment Companies</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">$0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">$0</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Other Pooled Investment Vehicles</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">$0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">$0</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Other Accounts</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">$0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">$0</FONT></TD></TR>
  </TABLE>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt NewsGoth Lt BT; margin-top: 6pt; margin-bottom: 0"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 4.5pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt"><SUP>(1)</SUP></FONT></TD><TD><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">As of May 31, 2022</FONT></TD></TR></TABLE>

<P STYLE="font: 9pt Arial, Helvetica, Sans-Serif; margin: 3pt 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt NewsGoth Lt 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 Dm BT,sans-serif"><B>2.</B></FONT></TD><TD><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif"><B>The following is added to the second table under &ldquo;Portfolio Managers.&rdquo;
in &ldquo;Investment Advisory and Other Services&rdquo;:</B></FONT></TD></TR></TABLE>

<P STYLE="font: 9pt/101% Arial, Helvetica, Sans-Serif; margin: 0 5.85pt 0 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 9pt NewsGoth XCn BT; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 27%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Portfolio Manager</FONT></TD>
    <TD STYLE="width: 37%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Dollar Range of Equity Securities<BR>
Beneficially Owned in the Trust</FONT></TD>
    <TD STYLE="width: 36%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Aggregate Dollar Range of Equity<BR>
Securities Beneficially Owned<BR>
in the Eaton Vance Family of Funds</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Sarah A. Choi<SUP>(1)</SUP></FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">None</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">$1 - $10,000</FONT></TD></TR>
  </TABLE>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 9pt Arial Narrow, Helvetica, Sans-Serif; margin-top: 6pt; margin-bottom: 0"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 9pt"><SUP>(1)</SUP></TD><TD>As of May 31, 2022</TD></TR></TABLE>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 9pt/101% Arial, Helvetica, Sans-Serif; margin: 0 5.85pt 0 0">&nbsp;</P>

<P STYLE="font: 9pt/101% Arial, Helvetica, Sans-Serif; margin: 0 5.85pt 0 0">&nbsp;</P>

<P STYLE="font: 9pt/101% Arial, Helvetica, Sans-Serif; margin: 0 5.85pt 0 0">&nbsp;</P>

<P STYLE="font: 9pt/101% Arial, Helvetica, Sans-Serif; margin: 0 5.85pt 0 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 7.25pt 0 3pt"><FONT STYLE="letter-spacing: -0.05pt">July 1, 2022</FONT></P>


</BODY>
</HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
