William Davin (19 February 1890 – 1 March 1956) was an Irish Labour Party politician who served as a Teachta Dála (TD) for over thirty years.
His first candidacy for public office was at the 1922 general election, when he stood as a Labour Party candidate in the Leix–Offaly constituency.
[2] He was returned to the 3rd Dáil, and was re-elected at each successive general election until his death in office in 1956.
[3] Following his death, a by-election was held on 30 April 1956 which was won by the Fianna Fáil candidate Kieran Egan.
[1] For most of this period, he was the only Labour deputy from Laois–Offaly, but after the June 1927 general election he was joined in the short-lived 5th Dáil by John Gill, who lost his seat at the September 1927 general election.