Caspar Peter Hagerup (12 April 1777 – 28 August 1840) was a Norwegian civil servant.
He was born in Christiansand. He enrolled as a student in 1797, and finished the studies to be appointed town clerk (byskriver) in the Danish town of Kalundborg in 1801. In 1809 he was appointed district stipendiary magistrate (sorenskriver) in Flekkefjord, in 1820 in Nordre Hedemarken. From 1830 to his death in 1840 he was burgomaster of Trondhjem.