Johannes Olai Olsen (3 October 1895 – 16 January 1974) was a Norwegian fisher and politician for the Labour Party.
He was elected to the Norwegian Parliament from Finnmark in 1945, and was re-elected on four occasions.
Olsen was mayor of Måsøy Municipality between 1928 and 1946, with the exception of a period between 1940 and 1945, during the German occupation of Norway.
His son Trygve Olsen later became mayor of Måsøy, as well as a cabinet member.
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