The Papal Basilica of Saint Paul Outside the Walls (Italian: Basilica Papale di San Paolo fuori le Mura, Latin: Basilica Sancti Pauli extra mœnia) is one of Rome's four major papal basilicas, along with the basilicas of Saint John in the Lateran, Saint Peter's, and Saint Mary Major, as well as one of the city's Seven Pilgrim Churches. The basilica is the conventual church of the adjacent Benedictine abbey. It lies within Italian territory, but the Holy See owns the basilica and it is part of the Vatican's extraterritoriality.
One of the oldest church sites in Rome, it was constructed outside the city's Aurelian Walls at what tradition holds to be the burial site of Saint Paul. It suffered a catastrophic fire in the 19th-century and the present building was completed in 1840.