Seán Thomas O'Kelly (Irish: Seán Tomás Ó Ceallaigh; 25 August 1882 – 23 November 1966), originally John T.
O'Kelly, was an Irish Fianna Fáil politician who served as the second President of Ireland from June 1945 to June 1959.
He also served as Tánaiste from 1937 to 1945, Minister for Finance from 1939 to 1945, Minister for Local Government and Public Health from 1932 to 1939, Vice-President of the Executive Council from 1932 to 1937, and Ceann Comhairle of Dáil Éireann from 1919 to 1921.
He served as a Teachta Dála (TD) from 1923 to 1945.