Major Deshamanya Duncan White, MBE, ED (1 March 1918 – 3 July 1998) was a Sri Lankan sportsman.
He was the first Ceylonese athlete to win an Olympic medal, winning silver in the 400-metre hurdles at the 1948 Summer Olympics in London, England.
He was also the only South Asian to have won an Olympic medal in track and field for more than fifty years, until Susanthika Jayasinghe, another Sri Lankan, won a silver medal in the 200 metres in 2000.