St. Leopold's Church is locared in Herceg Novi, near another catholic church of St. Jerome.

The church was built in 1688 on top of a destroyed mosque and was originally dedicated to the Assumption. It gained its present-day dedication to St. Leopold in 1976, at the same time as Leopold Mandic was beatified by the Pope.

Leopold Mandic (birth name Bogdan Mandic) was both in Herceg Novi on May 12th 1866, spending time as the priest of a Roman-Catholic church and a Capuchin monk. He spent around 40 years in a monastery in the Italian city of Padova. His claim to fame was pursuing the unification of Catholic and Orthodox curches. He was deitified in 1983.