Thomas O'Brien

Thomas O’Brien, Tom O’Brien, or Tommy O'Brien may refer to:

Politicians

• Thomas J. O'Brien (Illinois politician) (fl. 1933–1964), Illinois politician
• Thomas J. O'Brien (Massachusetts politician) (contemporary), Massachusetts State Representative
• Thomas J. O'Brien (Michigan politician) (1842–1933), Michigan politician and U.S. ambassador
• Thomas J. O'Brien (bishop) (born 1935), Bishop of Phoenix, 1982–2003
• Thomas P. O'Brien (born 1960), former United States Attorney for the Central District of California
• Tom O'Brien (trade unionist) (1900–1970), British trade unionist and Member of Parliament

Athletes

• Thomas O'Brien (footballer) (born 1991), Scottish footballer
• Tom O'Brien (second baseman) (1860–1921), baseball player
• Tom O'Brien (outfielder) (1873–1901), Major League Baseball outfielder/infielder
• Tom O'Brien (American football) (born 1948), former American college football coach at NC State
• Tom O'Brien (footballer, born 1889) (1889–1963), Australian rules footballer for University
• Tom O'Brien (footballer, born 1904) (1904–1983), Australian rules footballer for Melbourne
• Tom O'Brien (jockey) (born 1986), steeplechase rider who competed in four Grand Nationals up to 2010
• Tommy O'Brien (1918–1978), Major League Baseball outfielder

Others

• Thomas W. O'Brien (1862-1916) Canadian entrepreneur and pioneer.
• Thomas D. O'Brien (1859–1935), co-founder of William Mitchell College of Law
• Tom O'Brien (actor) (born 1965), American film actor
• Thomas O'Brien (bishop) (1792–1874), Church of Ireland Bishop of Ossory, Ferns, and Leighlin
• Thomas O'Brien (interior designer), American designer
• Tom O'Brien (swindler) (1851–1904), American confidence man and swindler