Seán Francis MacEntee was an Irish Fianna Fáil politician who served as Tánaiste from 1959 to 1965, Minister for Social Welfare from 1957 to 1961, Minister for Health from 1957 to 1965, Minister for Local Government and Public Health from 1941 to 1948, Minister for Industry and Commerce from 1939 to 1941, Minister for Finance from 1932 to 1939 and 1951 to 1954. He served as a Teachta Dála (TD) from 1918 to 1969. At the time of his death, he was the last surviving member of the First Dáil.

The Tánaiste is the second-ranking member of the government of Ireland and the holder of its second-most senior office. They are the equivalent of a deputy prime minister in other parliamentary systems.