William Ryan (21 September 1921 – 2 January 1994) was an Irish Fianna Fáil politician from County Tipperary in Ireland. He was a senator from 1961 to 1989.
Born in Kilfracle, County Tipperary, Ryan was elected in 1961 to the 10th Seanad on the Agricultural Panel. He was re-elected eight times, until he stood down at the 1989 election to the 19th Seanad.
Ryan also stood as a Fianna Fáil candidate for Dáil Éireann in the Tipperary South constituency at three successive general elections: 1965, 1969, 1973. He was unsuccessful on each occasion.