Tidemann Flaata Evensen (11 July 1905 – 16 September 1969) was a Norwegian politician for the Labour Party.
He was elected to the Norwegian Parliament from Telemark in 1945, and was re-elected on one occasion.
Evensen was born in Solum and was a member of Solum municipal council from 1933 to 1947, when he rose to the position of mayor. He held this position until 1959.
Outside politics he worked as a bureaucrat in Telemark county. He was County Governor of Telemark from 1959 to 1969.