Gunnar Fredrik Hellesen (23 February 1913 – 7 July 2005) was a Norwegian politician for the Conservative Party.
He was elected to the Norwegian Parliament from Rogaland in 1961, and was re-elected on one occasion.
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 was a member of Haugesund city council from 1945 to 1963, serving as mayor in from 1955 to 1959.
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