Ewen Daniel Mackinnon CBE (11 February 1903 – 7 June 1983) was an Australian politician.

The son of state MLA Donald Mackinnon, he was born in Melbourne and educated at Geelong Grammar School and then attended Oxford University.

He returned to Australia as a grazier at Linton before becoming a company director and serving in the military 1938–43.

In 1953 he returned to the House as the member for Corangamite, having been elected in the by-election that followed the death of Allan McDonald.

In 1966, Mackinnon retired from politics and was made a Commander of the Order of the British Empire (CBE).