The Diocese of Montepeloso (also Diocese of Irsina) (Latin: Dioecesis Montis Pelusii) was a Roman Catholic diocese located in the town of Montepeloso in the province of Matera in the Southern Italian region of Basilicata. It was united with the Diocese of Gravina (di Puglia) to form the Diocese of Gravina e Irsina (Montepeloso) in 1818.[1][2] The name "Irsina" was given to the town of Montepeloso by vote of the council of the commune on 6 February 1895.[3]