    <SEC-DOCUMENT>0001193125-25-021824-index.html : 20250206
    <SEC-HEADER>0001193125-25-021824.hdr.sgml : 20250206
    <ACCEPTANCE-DATETIME>20250206163516
    ACCESSION NUMBER:		0001193125-25-021824
    CONFORMED SUBMISSION TYPE:	S-1/A
    PUBLIC DOCUMENT COUNT:		8
    FILED AS OF DATE:		20250206
    DATE AS OF CHANGE:		20250206

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Winchester Bancorp, Inc./MD/
    		CENTRAL INDEX KEY:			0002047235
    		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
    		ORGANIZATION NAME:           	02 Finance
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		S-1/A
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-283752
    		FILM NUMBER:		25597923

    	BUSINESS ADDRESS:
    		STREET 1:		661 MAIN STREET
    		CITY:			WINCHESTER
    		STATE:			MA
    		ZIP:			01890
    		BUSINESS PHONE:		(781) 729-2130

    	MAIL ADDRESS:
    		STREET 1:		661 MAIN STREET
    		CITY:			WINCHESTER
    		STATE:			MA
    		ZIP:			01890
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>S-1/A
    <SEQUENCE>1
    <FILENAME>d914289ds1a.htm
    <DESCRIPTION>S-1/A
    <TEXT>
    Document 1 - file: d914289ds1a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-23.3
    <SEQUENCE>2
    <FILENAME>d914289dex233.htm
    <DESCRIPTION>EX-23.3
    <TEXT>
    Document 2 - file: d914289dex233.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g914289dsp205.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g914289dsp205.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>g914289g01k01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g914289g01k01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g914289g01k02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g914289g01k02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g914289g02g02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g914289g02g02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g914289g35m59.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g914289g35m59.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g914289wb_medium.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g914289wb_medium.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>