    <SEC-DOCUMENT>0000950170-24-037607-index.html : 20240328
    <SEC-HEADER>0000950170-24-037607.hdr.sgml : 20240328
    <ACCEPTANCE-DATETIME>20240328070627
    ACCESSION NUMBER:		0000950170-24-037607
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20231231
    FILED AS OF DATE:		20240328
    DATE AS OF CHANGE:		20240328
    EFFECTIVENESS DATE:		20240328

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			INNOSPEC INC.
    		CENTRAL INDEX KEY:			0001054905
    		STANDARD INDUSTRIAL CLASSIFICATION:	CHEMICALS & ALLIED PRODUCTS [2800]
    		ORGANIZATION NAME:           	08 Industrial Applications and Services
    		IRS NUMBER:				981081725
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-13879
    		FILM NUMBER:		24793461

    	BUSINESS ADDRESS:
    		STREET 1:		8310 SOUTH VALLEY HIGHWAY
    		STREET 2:		SUITE 350
    		CITY:			ENGLEWOOD
    		STATE:			CO
    		ZIP:			80112
    		BUSINESS PHONE:		7203556451

    	MAIL ADDRESS:
    		STREET 1:		8310 SOUTH VALLEY HIGHWAY
    		STREET 2:		SUITE 350
    		CITY:			ENGLEWOOD
    		STATE:			CO
    		ZIP:			80112

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	OCTEL CORP
    		DATE OF NAME CHANGE:	19980209
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>innospec_2023_form_10-k.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: innospec_2023_form_10-k.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>