UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549- FORM N-PX ANNUAL REPORT OF PROXY VOTING RECORD OF REGISTERED MANAGEMENT INVESTMENT COMPANY
Investment Company Act File Number :	811-03897
Name of Registrant:	Putnam Mortgage Securities Fund
Address of Principal Executive Offices:	100 Federal Street
	Boston, Massachusetts 02110
Name and address of agent of service:	Stephen J. Tate, Vice President and Chief Legal Officer
	Putnam Mortgage Securities Fund
	100 Federal Street
	Boston, Massachusetts 02110
CC:	Bryan Chegwidden, Esq.
	Ropes & Gray LLP
	1211 Avenue of the Americas
	New York, New York 10036
Registrant's telephone number including area code:	617-292-1000
Date of fiscal year end:	6/30
Date of reporting period:	07/01/2022 - 06/30/2023

Registrant Name :	Putnam Mortgage Securities Fund
Fund Name :	Putnam Mortgage Securities Fund
	The fund did not vote proxies relating to portfolio securities during the period covered by this report.

Pursuant to the requirements of the Investment Company Act of 1940,the registrant has duly caused this report to be signed on its behalf by the undersigned,thereunto duly authorised.
Registrant:	Putnam Mortgage Securities Fund
By:	/s/Stephen J. Tate
Name:	Stephen J. Tate
Title:	Vice President, Chief Legal Officer of Putnam Mortgage Securities Fund
Date:	August 23, 2023