Ulven detention camp (German: Polizeihäftlingslager Ulven, Norwegian: Ulven fangeleir ("Ulven" means "the wolf")) was a concentration camp in Norway that was located in what was Os Municipality in Hordaland county (now part of Bjørnafjorden Municipality in Vestland county). It was located just outside the village of Osøyro, 30 kilometres (19 mi) south of the city of Bergen. In the course of the summer of 1943, the prisoners at Ulven were used as slave labor to build the Espeland concentration camp in Bergen, to which the prisoners were transferred.