<SEC-DOCUMENT>0001193125-21-234935-index.html : 20210803
<SEC-HEADER>0001193125-21-234935.hdr.sgml : 20210803
<ACCEPTANCE-DATETIME>20210803161046
ACCESSION NUMBER:		0001193125-21-234935
CONFORMED SUBMISSION TYPE:	S-3ASR
PUBLIC DOCUMENT COUNT:		6
FILED AS OF DATE:		20210803
DATE AS OF CHANGE:		20210803
EFFECTIVENESS DATE:		20210803

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			UNITIL CORP
		CENTRAL INDEX KEY:			0000755001
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				020381573
		STATE OF INCORPORATION:			NH
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-3ASR
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-258405
		FILM NUMBER:		211139834

	BUSINESS ADDRESS:	
		STREET 1:		6 LIBERTY LANE WEST
		CITY:			HAMPTON
		STATE:			NH
		ZIP:			03842
		BUSINESS PHONE:		6037736504

	MAIL ADDRESS:	
		STREET 1:		6 LIBERTY LANE WEST
		CITY:			HAMPTON
		STATE:			NH
		ZIP:			03842
</SEC-HEADER>
<DOCUMENT>
<TYPE>S-3ASR
<SEQUENCE>1
<FILENAME>d605663ds3asr.htm
<DESCRIPTION>S-3ASR
<TEXT>
Document 1 - file: d605663ds3asr.htm

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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d605663dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: d605663dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>3
<FILENAME>d605663dex232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 3 - file: d605663dex232.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g605663deloitte.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g605663deloitte.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g605663g87d19.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g605663g87d19.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g605663snap0001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g605663snap0001.jpg

</DOCUMENT>
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