William John Duffy (7 April 1865 – 1 January 1945) was an Irish nationalist politician from County Galway.
[1] He was one of the few people to have served both in the United Kingdom House of Commons and in Dáil Éireann.
[citation needed] Duffy was elected at the 1900 general election as Member of Parliament (MP) for South Galway,[2] as an Irish Parliamentary Party candidate, and held the seat until his defeat at the 1918 general election by the Sinn Féin candidate Frank Fahy.
[3] At the June 1927 Irish general election, he was elected as National League Party Teachta Dála (TD) for Galway.
[4] He did not contest the September 1927 Irish general election.