Gunnar Fredrik Hellesen (23 February 1913 – 7 July 2005) was a Norwegian politician for the Conservative Party. He was born in Haugesund. He was elected to the Norwegian Parliament from Rogaland in 1961, and was re-elected on one occasion. He had previously served in the position of deputy representative during the term 1958–1961. On 5 June 1970 he was appointed Minister of Defence during the centre-right cabinet Borten, replacing Otto Grieg Tidemand who on the same day became Minister of Trade and Shipping. Hellesen held the position until the cabinet Borten fell in 1971.