The Roman Catholic Diocese of Belize City–Belmopan (Latin: Dioecesis Belizepolitanus-Belmopanus) is a diocese of the Latin Church of the Roman Catholic Church in continental Central America.

The diocese comprises the entirety of Belize, the former British dependency British Honduras.

It is a Latin suffragan of the Archdiocese of Kingston (on Jamaica) and a member of the Antilles Episcopal Conference,[1] yet still depends on the missionary Roman Congregation for the Evangelization of Peoples.

The cathedral of the diocese, also known as its mother church, is Holy Redeemer Cathedral in Belize City.

[3] As per 2014, it pastorally served 162,100 Catholics (48.5% of 334,297 total) on 22,963 km² in 13 parishes and 5 missions with 46 priests (14 diocesan, 32 religious), 2 deacons, 95 lay religious (38 brothers, 57 sisters) and a seminarian.