<SEC-DOCUMENT>0001752724-25-192575-index.html : 20250819
<SEC-HEADER>0001752724-25-192575.hdr.sgml : 20250819
<ACCEPTANCE-DATETIME>20250819145554
ACCESSION NUMBER:		0001752724-25-192575
CONFORMED SUBMISSION TYPE:	NPORT-P
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250630
FILED AS OF DATE:		20250819
DATE AS OF CHANGE:		20250819
PERIOD START:           	20251231

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NORTHWESTERN MUTUAL SERIES FUND INC
		CENTRAL INDEX KEY:			0000742212
		ORGANIZATION NAME:           	
		EIN:				391603401
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		NPORT-P
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-03990
		FILM NUMBER:		251231257

	BUSINESS ADDRESS:	
		STREET 1:		720 E WISCONSIN AVE
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53202
		BUSINESS PHONE:		4142992508

	MAIL ADDRESS:	
		STREET 1:		720 EAST WISCONSIN AVE
		CITY:			MILWAUKEE
		STATE:			WI
		ZIP:			53202

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NORTHWESTERN MUTUAL VARIABLE LIFE SERIES FUND INC
		DATE OF NAME CHANGE:	19940830
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000742212
<SERIES-ID>S000018229
<SERIES-NAME>Large Cap Blend Portfolio
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000050277
<CLASS-CONTRACT-NAME>Large Cap Blend Portfolio
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>NPORT-P
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

</DOCUMENT>
</SEC-DOCUMENT>