Seán Casey (9 May 1922 – 29 April 1967) was an Irish Labour Party politician and trade union official. He was first elected to Dáil Éireann as a Labour Party Teachta Dála (TD) for the Cork Borough constituency at the 1954 general election. He was re-elected at the 1957, 1961 and 1965 general elections. He died in April 1967 during the term of the 18th Dáil and the subsequent by-election held on 9 November 1967 was won by Seán French of Fianna Fáil.
He served as Lord Mayor of Cork on 3 separate occasions: in 1956, 1962 and 1966.