The Catholic Church in Belgium, part of the global Catholic Church in Belgium, is under the spiritual leadership of the Pope, the curia in Rome and the Episcopal Conference of Bishops.

The National Basilica of the Sacred Heart is a Roman Catholic minor basilica and parish church in Brussels, Belgium. It is dedicated to the Sacred Heart, inspired by the Basilique du Sacré-Coeur in Paris. Symbolically, King Leopold II laid the first stone in 1905 during the celebrations of the 75th anniversary of Belgian independence. The construction was halted by the two World Wars and finished only in 1970. Belonging to the Metropolitan Archdiocese of Mechelen–Brussels, it is one of the largest churches by area in the world.