Form EFFECT PUTNAM MORTGAGE SECURITI

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April 20, 2018 6:02 AM EDT

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Notice of Effectiveness
Effectiveness Date:	April 19, 2018

Accession Number:

0000928816-18-000570

Submission Type:

485APOS

CIK:

0000732337

Company Name:

PUTNAM MORTGAGE SECURITIES FUND

File Number:

002-87634

REFERENCED SERIES/CLASSES (CONTRACTS)

Series ID
	Class/Contract	Name
S000006570		PUTNAM U S GOVERNMENT INCOME TRUST
	C000017922	Class A Shares
	C000017923	Class B Shares
	C000017924	Class C Shares
	C000017925	Class M Shares
	C000017926	Class R Shares
	C000017927	Class Y Shares
	C000185164	Class T Shares
	C000200295	Class R6 Shares

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