The Roman Catholic Archdiocese of Santarém (Latin: Dioecesis Santaremensis) is a Latin Church metropolitan archdiocese in northern Brazil.

It was a suffragan diocese in the ecclesiastical province of Belém do Pará until 6 November 2019.

[1] Its cathedral episcopal see is Catedral Nossa Senhora da Conceição, dedicated to the Immaculate Conception, in the city of Santarém, Brazil.

As per 2014, it pastorally served 316,500 Catholics (70.2% of 451,000 total) on 171,906 km² in 22 parishes with 53 priests (26 diocesan, 27 religious), 90 lay religious (39 brothers, 51 sisters) and 19 seminarians.

When it was raised to an Archdiocese, it was given three suffragans.