Hartmann von Brixen was a German prelate and bishop who led the diocese of Brixen from 1140 until 1164. Born into Bavarian nobility in Passau around 1090, he was educated by the Augustinian Order. Throughout his career, he served as a priest, a dean in Salzburg, and a prior. As a bishop, he focused on reforming the clergy and supporting various religious orders, including the Benedictines, while maintaining a notable relationship with Emperor Frederick Barbarossa.