Seán Hayes (1890 – 4 January 1968) was an Irish revolutionary and politician.
During the Irish War of Independence, he joined the South Tipperary Brigade Active Service Unit (ASU) in Summer 1920 under the command of Seán Treacy, Ernie O'Malley and Dan Breen.
[2] He took part in several ambushes of British forces and attacks on Royal Irish Constabulary Barracks in counties Tipperary, Waterford and Kilkenny.
Taking the anti-Treaty side in the Irish Civil War, Hayes took part in fighting against the National Army during the Battle of Dublin in late June-early July 1922, and was promoted to Brigade Commandant of South Tipperary Brigade, IRA.
He took part in several attacks and ambushes of National forces in counties Tipperary and Kilkenny and was with Liam Lynch when he was killed in April 1923.