<SEC-DOCUMENT>0001104659-26-030114.txt : 20260318
<SEC-HEADER>0001104659-26-030114.hdr.sgml : 20260318
<ACCEPTANCE-DATETIME>20260318094030
ACCESSION NUMBER:		0001104659-26-030114
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20260318
FILED AS OF DATE:		20260318
DATE AS OF CHANGE:		20260318

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Papalexopoulos Dimitrios
		CENTRAL INDEX KEY:			0002115101
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-41858
		FILM NUMBER:		26766291

	MAIL ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		ETHNARCHOU MAKARIOU AVE.
		STREET 2:		& 2 D. FALIREOS ST.
		CITY:			N. FALIRO
		PROVINCE COUNTRY:   	J3
		ZIP:			185 47

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Okeanis Eco Tankers Corp.
		CENTRAL INDEX KEY:			0001964954
		STANDARD INDUSTRIAL CLASSIFICATION:	DEEP SEA FOREIGN TRANSPORTATION OF FREIGHT [4412]
		ORGANIZATION NAME:           	01 Energy & Transportation
		EIN:				000000000
		STATE OF INCORPORATION:			1T
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ETHNARCHOU MAKARIOU AV, & 2 D. FALIREOS
		STREET 2:		C/O OET CHARTERING INC.
		CITY:			N. FALIRO
		STATE:			J3
		ZIP:			185 47
		BUSINESS PHONE:		302104804087

	MAIL ADDRESS:	
		STREET 1:		ETHNARCHOU MAKARIOU AV, & 2 D. FALIREOS
		STREET 2:		C/O OET CHARTERING INC.
		CITY:			N. FALIRO
		STATE:			J3
		ZIP:			185 47
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>tm268494-10_3seq1.xml
<DESCRIPTION>OWNERSHIP DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-03-18</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001964954</issuerCik>
        <issuerName>Okeanis Eco Tankers Corp.</issuerName>
        <issuerTradingSymbol>ECO</issuerTradingSymbol>
        <issuerForeignTradingSymbol>OET</issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002115101</rptOwnerCik>
            <rptOwnerName>Papalexopoulos Dimitrios</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>ETHNARCHOU MAKARIOU AVE. &amp; 2 D.</rptOwnerStreet1>
            <rptOwnerStreet2>FALIREOS ST.</rptOwnerStreet2>
            <rptOwnerCity>N. FALIRO</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>J3</rptOwnerCountry>
            <rptOwnerZipCode>185 47</rptOwnerZipCode>
            <rptOwnerStateDescription>GREECE</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Exhibit List:
24: Power of Attorney of Dimitrios Papalexopoulos dated March 10, 2026</remarks>

    <ownerSignature>
        <signatureName>/s/ Irene Chaidemenou, Attorney-in-Fact, pursuant to power of attorney attached hereto</signatureName>
        <signatureDate>2026-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>tm268494d10_ex24.htm
<DESCRIPTION>EXHIBIT 24
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Exhibit&nbsp;24</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">LIMITED POWER OF ATTORNEY FOR</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SECTION&nbsp;16 REPORT OBLIGATIONS</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">RELATING TO</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">OKEANIS ECO TANKERS CORP.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Know all by these presents, that the undersigned
hereby makes, constitutes and appoints each of Iraklis Sbarounis and Irene Chaidemenou, each acting individually, as the undersigned&rsquo;s
true and lawful attorney-in-fact, with full power and authority as hereinafter described on behalf of and in the name, place and stead
of the undersigned to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">(1)&nbsp;prepare, execute, acknowledge, deliver
and file Forms 3, 4 and 5 (including any amendments thereto) with respect to the securities of Okeanis Eco Tankers Corp., a Marshall Islands
corporation (the &ldquo;<B>Company</B>&rdquo;), with the United States Securities and Exchange Commission, the New York Stock Exchange,
the Nasdaq, any other national securities exchange and the Company, as considered necessary or advisable under Section&nbsp;16(a)&nbsp;of
the Securities Exchange Act of 1934 and the rules&nbsp;and regulations promulgated thereunder, as amended from time to time (the &ldquo;<B>Exchange
Act</B>&rdquo;);</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">(2)&nbsp;seek or obtain, as the undersigned&rsquo;s
representative and on the undersigned&rsquo;s behalf, information on transactions in the Company&rsquo;s securities from any third party,
including brokers, employee benefit plan administrators and trustees, and the undersigned hereby authorizes any such person to release
any such information to the undersigned and approves and ratifies any such release of information;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">(3)&nbsp;do and perform any and all acts for and
on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form&nbsp;3, 4, or 5 and any amendments
thereto and timely file such forms with the United States Securities and Exchange Commission and any stock exchange or similar authority,
including, but not limited to, taking any actions necessary or desirable in connection with effectuating electronic filings; and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">(4)&nbsp;take any other action of any type whatsoever
which, in the opinion of such attorney-in-fact, may be necessary or desirable in connection with the foregoing authority, it being understood
that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such
form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact&rsquo;s discretion.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The undersigned acknowledges that:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">(1)&nbsp;this Power of Attorney authorizes, but
does not require, each such attorney-in-fact to act in their discretion on information provided to such attorney-in-fact without independent
verification of such information;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">(2)&nbsp;any documents prepared and/or executed
by any such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney will be in such form and will contain such
information and disclosure as such attorney-in-fact, in his discretion, deems necessary or desirable;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">(3)&nbsp;neither the Company nor any of such attorneys-in-fact
assumes (i)&nbsp;any liability for the undersigned&rsquo;s responsibility to comply with the requirement of the Exchange Act, or (ii)&nbsp;any
liability of the undersigned for any failure to comply with such requirements; and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">(4)&nbsp;this Power of Attorney does not relieve
the undersigned from responsibility for compliance with the undersigned&rsquo;s obligations under the Exchange Act, including without
limitation the reporting requirements under Section&nbsp;16 of the Exchange Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The undersigned hereby gives and grants to each
of the foregoing attorneys-in-fact attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done and about in the exercise of any of the rights and powers herein granted, as fully to all intents
and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying
and confirming, for and on behalf of the undersigned, all that such attorney-in-fact, or such attorney-in-fact&rsquo;s substitute or substitutes,
shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">This Power of Attorney shall remain in full force
and effect until revoked by the undersigned in a signed writing delivered to each such attorney-in-fact.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">IN WITNESS WHEREOF, the undersigned has caused
this Power of Attorney to be executed as of this 10th day of March, 2026.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid; width: 50%; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">/s/ Dimitrios Papalexopoulos</FONT></TD>
    <TD STYLE="width: 50%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Name:&nbsp;Dimitrios Papalexopoulos</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  </TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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