This article analyzes religious, political and national aspects of beatification and canonization Leopold Bogdan Mandić (1866-1942). Mandić is the only Catholic saint who was born in Montenegro. For blessed was declared in 1976, a saint in 1983. In the history of the Catholic Church, he was among the fastest beatified and canonized saints. The reasons for this were numerous. The Vatican is in this way wanted to implement its policy toward the communist regime in Yugoslavia. The Catholic Church in Croatia is keen to use these events to promote Croatian nationalism in Montenegro, especially in the Bay of Kotor, where Mandić was born. The Catholic Church in Montenegro is in this way wanted to preserve and strengthen the Catholic faith in Montenegro where Orthodoxy was dominant. The article was created solely on the basis of archival sources from the fund of the Republican Commission for Religious Affairs of Montenegro.