The Diocese of Kotor (Montenegrin: Которска шкофија, romanized: Kotorska škofija; 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.

Marije od Rijeke) following the 1979 earthquake where the probable foundations of the first cathedral in Cattaro was discovered with remains, such as the cathedra and ciborium from the 6th century.

Afterward, since 1090 till the present day, a complete list has existed, beginning with bishop Grimoald, of Lombard origin.

In 1063, Pope Alexander II issued a papal bull in which Cattaro is also mentioned as a suffragan of the Archdiocese of Barium (Bari), previously known as the Diocese of Canusium.

Under the diocesan jurisdiction were: Prizren, Janjevo, Novo Brdo, Novi Pazar, Brskovo, Golubac, Brvenik, Plana, Mačva, Trepča, Trgovište and Belgrade.

In 1880, the parishes of Spič, Šušanj and Brca, which had originally belonged to the Archdiocese of Antivari, was transferred to the Diocese of Cattaro by the decision of the Sacred Congregation for the Propagation of the Faith.

The diocese encompasses the settlements of Herceg Novi, Kotor, Tivat, Risan, Perast, Dobrota, Prčanj, Bijela, Budva and Sutomore.