Thomas or Tom Brennan may refer to:
- Thomas Brennan (Irish Land League) (1853âÂÂ1912), Irish politician
- Thomas Brennan (Fianna Fáil politician) (1886âÂÂ1953), Irish politician
- Thomas Brennan (Victorian state politician) (1900âÂÂ1966), Victorian state MP
- Thomas Brennan (footballer) (1911âÂÂ?), Scottish professional footballer
- Thomas Brennan (equestrian) (1940âÂÂ2014), Irish equestrian
- Thomas E. Brennan (1929âÂÂ2018), American jurist, Chief Justice of the Michigan Supreme Court
- Thomas Francis Brennan (1855âÂÂ1916), American Catholic bishop; 1st Catholic bishop of Dallas 1891âÂÂ1893
- Tom Brennan (politician) (1866âÂÂ1944), Australian Senator
- Tom Brennan (basketball, born 1930) (1930âÂÂ1990), basketball player for Villanova University and the Philadelphia Warriors
- Tom Brennan (basketball, born 1949) (born 1949), American sportscaster and former University of Vermont basketball coach
- Tom Brennan (baseball) (born 1952), 1980s baseball player
- Tom Brennan (civil servant) (1928âÂÂ2013), Oklahoma civil servant and businessman
- Tom Brennan (footballer), English soccer player
- Tom Brennan (ice hockey) (1922âÂÂ2003), American ice hockey player for Boston Bruins
- Tom Brennan (speedway rider) (born 2001), British speedway rider
- Thom Brennan (born 1957), American musician
- Tommy Brennan (trade unionist) (1932âÂÂ2022), Scottish political activist
- Tommy Brennan, American comedian and cast member on Saturday Night Live season 51
See also
- Tom Brennan (barge), a 1949 barge used in outback South Australia during flooding of Coppers Creek
- Thomas Brannan (1893âÂÂ1960), English rugby league footballer of the 1910s and 1920s