The Diocese of Kotor (Montenegrin: Которска бискупија, Kotorska biskupija; Croatian: Kotorska biskupija; Latin: Dioecesis Catharensis) is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church in the Bay of Kotor and Municipality of Budva area in Montenegro. It is centered in the city of Kotor (Cattaro). It was erected as a diocese in the 10th century. The current bishop is Mladen Vukšić.
The diocese's cathedral is the Cathedral of Saint Tryphon in Kotor.
The Cathedral of Saint Tryphon (Serbo-Croatian: Katedrala Svetog Tripuna/Катедрала Светог Трипуна) in Kotor, Montenegro, is one of two Roman Catholic cathedrals in Montenegro. It is the seat of the Roman Catholic Diocese of Kotor, which covers the entire Bay of Kotor and Municipality of Budva.
The Catholic Church in Montenegro (Montenegrin: Католичка црква у Црној Гори, romanized: Katolička crkva u Crnoj Gori; Albanian: Kisha katolike në Mal të Zi; Croatian: Katolička Crkva u Crnoj Gori) is part of the worldwide Catholic Church, under the spiritual leadership of the Pope in Rome.
There were 20,000 Catholics in Montenegro in 2020, and they formed 2.8% of the population. Most Catholics are ethnic Albanians, Montenegrins, and Croats.