The diocese of Montefiascone (Latin Name: Faliscodunensis o Montis Falisci) was a Catholic ecclesiastical territory in Italy. It was created from the diocese of Bagnorea in 1369.[1] In 1986 was incorporated into the diocese of Viterbo, Acquapendente, Bagnoregio, Montefiascone, Tuscania e San Martino al Monte Cimino.[2][3] The diocese was immediately subject to the Holy See.