St. Peter is a Roman Catholic church in Danbury, Connecticut, part of the Diocese of Bridgeport. St. Peter's was the first Catholic church built in northern Fairfield County. It is the third oldest parish, and the fifth oldest Roman Catholic Church in the Diocese of Bridgeport. St. Peter's was originally a predominantly Irish congregation. Danbury's Annual St. Patrick's Day Parade steps off in front of St. Peter's. In more recent time, the parish has a significant number of parishioners of Latino and Brazilian heritage.