The Diocese of Santarém (Latin: Dioecesis Santaremensis in Lusitania) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Portugal, erected on 16 July 1975 by Pope Paul VI.

It is a suffragan of the ecclesiastical province of the metropolitan Patriarchate of Lisbon.

[1] Its episcopal see at Santarém is north-east of Lisbon.

The current bishop is José Augusto Traquina Maria, appointed in 2017.

This article about a Roman Catholic diocese in Portugal is a stub.