Saint Lars church ruin, church building in Gotland Municipality, Sweden

Saint Lars church ruin is the remains of a church built in the early 13th century in the historic center of Visby on Gotland. The preserved stone walls show the original structure with the oldest section being the choir, revealing the size and importance of this medieval place of worship.

The choir, the oldest part, may date from the 12th century. The church was established around 1210–1220 as the parish church of the Gotlanders in Visby's central parish, created after population growth. Around 1240 St. Drotten's was built in the same churchyard for the Germans. Both were abandoned after the Reformation under Gustav Vasa in the 1530s.

The church takes its name from Saint Lawrence, a Roman deacon martyred in 258, and was sometimes also called St. Anna after the mother of the Virgin Mary. It served as the parish church of the Gotlanders in Visby's central parish, while the adjacent Drotten church, built around 1240, was the German parish church.

The ruin is located in Visby's old town and is easily accessible on foot, often visited together with other nearby historic sites. Access is open and free, with information signs at the site explaining the history and architecture.

Sankt Lars deviates from the other Visby churches in form and was probably inspired by Byzantine architecture, while its neighbours followed German models. It has been suggested, wrongly, that the church was Russian; a more reasonable reading is an architect influenced by Russian architecture. The choir is the oldest part, possibly 12th-century.