St. Gangolf's church, Gothic parish church in Trier, Germany.

St. Gangolf is a Gothic parish church in the center of Trier, built with pointed arches, ribbed vaults, and flying buttresses. The building rises in several layers, and its tall windows draw daylight deep into the interior.

An earlier church stood on this site from the 10th century, and construction of the current Gothic building began in 1284. Between the early 1500s and the mid-1700s, Baroque elements were added on top of the medieval structure.

The church is dedicated to St. Gangulphus, whose statue with shield and spear stands in a shell niche above the Rococo portal from the main market. The stained-glass windows include Charles Crodel's guild windows of 1966–67 showing patron saints of the trades. The St. Sebastianus marksmen's brotherhood, founded in 1461, is represented in the choir fresco by its patron Sebastian.

The church sits close to the main market square and is easy to reach on foot from most of the city center. From here, many other historical sites are within walking distance, making it a natural stop on any tour of the area.

The church is almost entirely enclosed by houses; only its east side nearly touches Grabenstraße, and even there low shop stalls called Gädemcher have stood since the Middle Ages. The main entrance at the foot of the tower is reached from the Hauptmarkt through a small Rococo gate of 1731/32 by the Augustinian Joseph Walter, with a shell niche holding St. Gangolf bearing shield and spear.