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- Temperance "Bones" Brennan, a fictional character from the television series Bones
- Terence "Terry" Patrick Brennan, American Football Coach, Notre Dame, 1953-58
- Thomas Brennan (Irish Land League) (1853–1912), Irish politician
- Thomas Brennan (Fianna Fáil) (died 1953), Irish politician
- Thomas E. Brennan (born 1929), American jurist, former Chief Justice of the Michigan Supreme Court
- Thomas Francis Brennan (1853–1937), American Catholic bishop; 1st Catholic bishop of Dallas 1891–1893
- Tom Brennan (politician)
- Tom Brennan (basketball coach), American sportscaster and former University of Vermont basketball coach
- Tom Brennan (basketball), basketball player for Villanova University and the Philadelphia Warriors
- Tom Brennan (baseball), 1980s baseball player
- Tom Brennan (ice hockey) (1922–2003), American ice hockey player for Boston Bruins
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