Lionel O. Booth (12 June 1914 – 31 May 1997) was an Irish Fianna Fáil politician and businessman. He was a Teachta Dála (TD) for twelve years, from 1957 to 1969. He was educated at Wesley College in Ballinteer, Dublin, and Trinity College Dublin. He qualified as a solicitor in 1938 and served as a captain in the Army during the Emergency. Booth is probably best be remembered as an astute businessman. He was both the joint managing director of Booth Poole & Co Ltd from 1956 and managing director of the Brittain Group from 1970.