Archcathedral Basilica of the Assumption of the Blessed Virgin Mary and St. Andrew, Frombork

Frombork Cathedral or the Archcathedral Basilica of the Assumption of the Blessed Virgin Mary and Saint Andrew (Polish: Bazylika archikatedralna Wniebowzięcia Najświętszej Maryi Panny i św. Andrzeja we Fromborku) in Frombork, Poland, is a Roman Catholic church located in the small town of Frombork in northern Poland. Constructed between 1329 and 1388, it replaced an earlier building dating from 1288.

It stands on Cathedral Hill on Cathedral Street (ul. Katedralna 8). The basilica is on Poland's official national Historic Monuments List (Pomnik historii), designated on 16 September 1994. It comes under the National Heritage Board of Poland.