St John the Baptist Church, also known as St John's Roman Catholic Church, is located in Perth, Perth and Kinross, Scotland. It is a Roman Catholic congregation, based on Melville Street, to the north of the city centre. Completed in 1832, it is now a Category C listed building. A high altar and a new sacristy were added to the church in 1848, and eight years later it was lengthened by 37 feet (11 m). A traceried window was inserted at that time. In 1892, its roof was raised over the older portion, and its apse completed, the work of Andrew Heiton.