William "Billy" Kenneally (12 October 1925 − 26 August 2009) was an Irish Fianna Fáil politician. He first stood for election at the 1961 general election but was unsuccessful.
He was first elected to Dáil Éireann as a Fianna Fáil Teachta Dála (TD) for the Waterford constituency at the 1965 general election. He was re-elected at each subsequent election until he lost his seat at the February 1982 general election. He was elected to the 16th Seanad in 1982 on the Administrative Panel. He did not contest the 1983 Seanad election.
He died in Waterford Regional Hospital on 26 August 2009.
His father William Kenneally also served as a TD for Waterford from 1952 to 1961 and his son Brendan Kenneally is a former TD for Waterford.