Holy Trinity Catholic Church is a Roman Catholic church of the Archdiocese of Dubuque, located in Luxemburg, Iowa. The parish dates back to the 1850s when families living in the area requested a church from Diocesan officials. Construction on the current church building began in 1874 and was finished in 1875. The church later became part of the St. LaSalle Pastorate - which is a parish that covers the churches in Luxemburg, Balltown, Holy Cross, Rickardsville, and Sherrill, Iowa.