Lorcan Allen (born 27 March 1940) is an Irish farmer and former Fianna Fáil politician. Allen was elected to Dáil Éireann as a Fianna Fáil TD for the Wexford constituency at the 1961 general election. Aged 21 years and 6 months at the time, he is the third youngest ever TD. He held his seat in 6 succeeding general elections until his defeat at the November 1982 general election. He also unsuccessfully contested the next two general elections. Allen was a member of Wexford County Council from 1985 to 2009, and of Gorey Town Council from 1999 to 2014.