Timothy (Ted) O'Sullivan (26 July 1899 – 3 March 1971) was an Irish Fianna Fáil politician from County Cork. He was a Teachta Dála (TD) for 27 years, and a Senator for 15 years. O'Sullivan was elected to Dáil Éireann at his first attempt, as a Fianna Fáil candidate for the Cork West constituency at the 1937 general election. He was re-elected for Cork West at the next five general elections, until he retired from the Dáil at the 1954 general election. His niece Peggy Farrell was a senator from 1969 to 1973.