St. Martin's Church (Croatian: Crkva Svetog Martina) is a Roman Catholic church in Split, Croatia. Built into a small space (an early guardhouse) within the ancient Golden Gate of Diocletian's northern wall, it is one of the oldest churches in the city. St. Martin's Church is one of Split's tourist attractions and is known for its fine 11th century chancel screen. It is currently in the care of the Dominican sisters, who have a monastery next door. The church itself is open to the public to visit.