Thomas Brennan
Thomas or Tom Brennan may refer to:
- Thomas Brennan (Irish Land League), Irish politician
- Thomas Brennan (Fianna Fáil politician), Irish politician
- Thomas Brennan (Victorian state politician), Victorian state MP
- Thomas Brennan (footballer), Scottish professional footballer
- Thomas Brennan (equestrian), Irish equestrian
- Thomas E. Brennan, American jurist, Chief Justice of the Michigan Supreme Court
- Thomas Francis Brennan, American Catholic bishop; 1st Catholic bishop of Dallas 1891–1893
- Tom Brennan (politician), Australian Senator
- Tom Brennan (basketball, born 1930), basketball player for Villanova University and the Philadelphia Warriors
- Tom Brennan (basketball, born 1949), American sportscaster and former University of Vermont basketball coach
- Tom Brennan (baseball), 1980s baseball player
- Tom Brennan (civil servant), Oklahoma civil servant and businessman
- Tom Brennan (footballer), English soccer player
- Tom Brennan (ice hockey), American ice hockey player for Boston Bruins
- Tom Brennan (speedway rider), British speedway rider
- Thom Brennan, American musician
- Tommy Brennan (trade unionist), Scottish political activist
- Tommy Brennan, American comedian and cast member on Saturday Night Live season 51