Finn Hannibal Kjelstrup (7 November 1884 – 5 December 1961) was a Norwegian military officer and civil servant for Nasjonal Samling. He graduated from the Norwegian Military Academy in the same class as Vidkun Quisling. He had a military and civil career, and was an assistant secretary in the Ministry of Defence (headed by Quisling from 1931 to 1933) in 1940. He was also a member of Quisling's Fascist party Nasjonal Samling. Before the First World War Kjelstrup served the king of Belgium in the Congo Free State.