Lieutenant General Friherre Regner Niels Carlsson Leuhusen (22 December 1900 – 10 March 1994) was a Swedish Army officer.

Leuhusen became an officer candidate in Svea Life Guards on 7 September 1919 and enrolled at the Military Academy Karlberg in Stockholm on 15 October 1920.

[4] Leuhusen was major in the General Staff Corps in 1942[1] and served as head of the Central Department in the Army Inspectorate (Arméinspektionen) from 1942.

[1] Besides his military career, Leuhusen was the King in Council's representative at the Central Board of the National [Swedish] Rifle Clubs (Skytteförbundens överstyrelse) from 1947.

In 1933, Leuhusen married Marie-Louise Cervell (1902–1994), the daughter of consul Gustaf Johanson and Anna (née Valentin).