Thomas Harris (1895 – 18 February 1974) was an Irish Fianna Fáil politician. A native of Cloncurry, he was raised in Prosperous, County Kildare by his aunt Elizabeth Tierney. As a young man he joined Conradh na Gaeilge in Prosperous, and subsequently joined the Irish Republican Brotherhood. Harris fought with the Maynooth contingent in 1916 Easter Rising in Dublin. He was captain of the Prosperous Company in 1917 and later Vice-Commandant North Kildare Battalion of the Irish Republican Army in 1921. Harris was related to Matthew Harris, MP for Galway East from 1885 to 1890.