Thor Thorvaldsen (May 31, 1909 – June 30, 1987) was a Norwegian sailor and Olympic champion.
He was born in Bamble and died in Bærum.
He competed at the 1948 Summer Olympics in London, where he received a gold medal in the dragon class as helmsman on the boat Pan.He competed at the 1952 Summer Olympics in Helsinki, where he again received a gold medal with Pan.