<SEC-DOCUMENT>0001193125-17-332822-index.html : 20171103
<SEC-HEADER>0001193125-17-332822.hdr.sgml : 20171103
<ACCEPTANCE-DATETIME>20171103161517
ACCESSION NUMBER:		0001193125-17-332822
CONFORMED SUBMISSION TYPE:	S-3
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20171103
DATE AS OF CHANGE:		20171103

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-3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-221333
		FILM NUMBER:		171176580

	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-3
<SEQUENCE>1
<FILENAME>d442035ds3.htm
<DESCRIPTION>S-3
<TEXT>
Document 1 - file: d442035ds3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>d442035dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: d442035dex51.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.2
<SEQUENCE>3
<FILENAME>d442035dex232.htm
<DESCRIPTION>EX-23.2
<TEXT>
Document 3 - file: d442035dex232.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g442035g03x49.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g442035g03x49.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g442035g84p01.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g442035g84p01.jpg

</DOCUMENT>
</SEC-DOCUMENT>