The Primatial Basilica of the Assumption of the Blessed Virgin Mary and St Adalbert, also known as the Esztergom Basilica, is an ecclesiastic basilica in Esztergom, Hungary, the mother church of the Archdiocese of Esztergom-Budapest, and the seat of the Catholic Church in Hungary. It is dedicated to the Assumption of Saint Mary and Saint Adalbert.

Esztergom is a city with county rights in northern Hungary, 46 kilometres northwest of the capital Budapest. It lies in Komárom-Esztergom County, on the right bank of the river Danube, which forms the border with Slovakia there. Esztergom was the capital of Hungary from the 10th until the mid-13th century when King Béla IV of Hungary moved the royal seat to Buda.