Thomas Brennan (died 22 January 1953) was an Irish Fianna Fáil Party politician who sat for 9 years as a TD for Wicklow.
A building contractor before entering politics, Brennan first stood for election to Dáil Éireann at the 1943 general election, but failed to win a seat. The following year, at the 1944 general election, he unseated his Fianna Fáil colleague Christopher Byrne and took his seat in the 15th Dáil. He was re-elected at the 1948 election and again at the 1951 general election, but died on 22 January 1953.
The by-election for his seat was held on 18 June, and won by the Fine Gael candidate Mark Deering.
At the 1954 general election, his son, Paudge Brennan, regained the seat for Fianna Fáil, beginning a 30-year career in the Oireachtas.