William Alexander Watson Sheldon (18 January 1907 – 1 November 1999) was an Irish politician and farmer. He was first elected to Dáil Éireann at the 1943 general election as a Clann na Talmhan Teachta Dála (TD) for the Donegal East constituency. He was re-elected as an independent TD at the 1944, 1948, 1951, 1954 and 1957 general elections. He did not contest the 1961 general election as the constituency was reduced from 4 to 3 seats but was nominated by the Taoiseach, Seán Lemass to the 10th Seanad. He was re-nominated to the Seanad in 1965 and 1969, and he retired from politics in 1973. He was also a member of Donegal County Council from 1945 to 1955.