Hans Reidar Holtermann (born 20 October 1895 in Sokndal, died 25 November 1966 in Bærum) was a Norwegian military officer. Holtermann is best known as the commander of Hegra Fortress during the Battle of Hegra Fortress in the Norwegian Campaign of 1940.During the inter-war years Holtermann attended military college in both Norway and France.After the war he continued his military service, among other missions commanding the Independent Norwegian Brigade Group in Germany in 1949–1950.