St. Catherine's Church, Baroque church in Frankfurt's Hauptwache district, Germany

St. Catherine's is a single-nave church of rendered rubble masonry with red Main sandstone trim, built 1678–1681 by Melchior Heßler. Its 54-metre tower rises on the north side toward the Hauptwache, not centrally: a square shaft of 9 by 9 metres topped by a baroque welsche Haube. The long north side serves as the main front, since the medieval Staufenmauer blocked a west facade.

Construction took place between 1678 and 1681 under architect Melchior Heßler as a baroque structure. After severe damage during World War II, the building was fully restored between 1950 and 1954.

The church is named after Saint Catherine of Alexandria, to whom the medieval convent on this site was dedicated. Its musical tradition dates to 1625, when Laurentius Erhardi became the first director of church music; Georg Philipp Telemann held the city's music directorship from 1712 to 1721, which included the church music here. Today a concert series is built around the Rieger organ installed in 1990.

The main entrance now faces west, after the postwar rebuild moved it from the north side. The church stands directly at the Hauptwache, so it is easily reached on foot or by U-Bahn. During the 1960s subway construction the building was temporarily hard to enter.

The tower clock stopped at 09:43 on 22 March 1944, the moment of the air raid that gutted the church, and stayed there for ten years. Eight Baroque gallery paintings that survived the war, including Hosea's Sermon, hang in the west gallery; more than 80 were shown in a 2005 exhibition in Halle.