The Benedictine Pannonhalma Archabbey (Territorial Abbey of Pannonhalma, Latin: Abbatia Territorialis Sancti Martini in Monte Pannoniae) is the most notable landmark in Pannonhalma and one of the oldest historical monuments in Hungary, founded in the year 996. It is located near the town, on top of a hill (282 m). Saint Martin of Tours is believed to have been born at the foot of this hill, hence its former name, Mount of Saint Martin (Hungarian: Márton-hegy), from which the monastery occasionally took the alternative name of Márton-hegyi Apátság. This is the second largest territorial (i.e., approx. sovereign) abbey in the world, after the one in Monte Cassino.^{[citation needed]}

Its notable sights include the Basilica with the Crypt (built in the 13th century), the Cloisters, the monumental Library with 360,000 volumes, the Baroque Refectory (with several examples of trompe l'oeil) and the Archabbey Collection (the second biggest in the country).

Today there are about 50 monks living in the monastery. The abbey is supplemented by the Benedictine High School, a boys' boarding school.