The Roman Catholic Archdiocese of Belém do Pará is an archdiocese located in the city of Belém in Brazil. It covers 3,566,079 square kilometres (1,376,871 sq mi) and is organized into 80 parishes. The Archdiocese covers the municipalities of Belém, Ananindeua, Benevides, Marituba, and Santa Bárbara do Pará.

The Our Lady of Grace Cathedral also called Catedral Nossa Senhora de Belém. It is the seat of the Roman Catholic Archdiocese of Belém do Pará and is located in the old quarter of the city in Belém in Brazil. The cathedral is dedicated to Our Lady of Grace, and dates to the earliest settlement of the Portuguese in Belém. The first chapel dedicated to Our Lady of Grace was a temporary structure inside the Presépio Fort; it was moved to a large square in front of the fort. The current structure, the third, was built in the Baroque style, but was later modified with numerous Neoclassical architecture elements by the architect João Landi. The cathedral was listed as a historic structure by the National Historic and Artistic Heritage Institute in 1940.