The Roman Catholic Archdiocese of Antsiranana is one of five Metropolitan Latin Archdioceses in Madagascar. Although it has its ecclesiastical province, it remains subject to the missionary Roman Congregation for the Evangelization of Peoples.

Antsiranana, named Diego-Suarez prior to 1975, is a city in the far north of Madagascar. Antsiranana is the capital of Diana Region. It had an estimated population of 115,015 in 2013.