Tom O'Brien (17 August 1900 - 5 May 1970) was a British trade unionist and Labour Party politician, and a Member of Parliament (MP) from 1945 to 1959.

He was elected at the 1945 general election as MP for Nottingham West, and after that constituency's abolition in boundary changes, he was re-elected at the 1950 general election for the new Nottingham North West seat. That constituency was in turn abolished for the 1955 general election, when he was returned to the House of Commons for the re-established Nottingham West seat.

O'Brien was General Secretary of the National Association of Theatrical and Kine Employees from 1932 until his death, and a member of the TUC's International Committee.

Thomas P. O'Brien (born October 5, 1948), is an American college football coach. He is the current head coach of the North Carolina State Wolfpack. Previously, O'Brien was the head coach at Boston College and served as an assistant at Virginia and Navy.

Thomas H. (Tom) O'Brien (June 22, 1860 - April 21, 1921) was an infielder/outfielder in Major League Baseball who played for five clubs in parts of six seasons between 1882 and 1890. O'Brien batted and threw right handed. He was born in Salem, Massachusetts.

A valuable utility, O'Brien played at least one game in each position except shortstop. He reached the majors in 1882 with the Worcester Ruby Legs (NL), spending one year with them before moving to the Baltimore Orioles (AA), 1883), Boston Reds (UA, 1884), again with Baltimore (1885), and the New York Metropolitans (AA, 1887) and Rochester Broncos (AA, 1890). His most productive season came in 1884 with Boston, when he appeared in 103 games while hitting .263 with four home runs, 118 hits, 31 doubles, eight triples and 80 runs scored –all career-numbers.

In 270 games, O'Brien was a .231 hitter (257-for-1111), including 74 extrabases and 61 RBI.

O'Brien died in Worcester, Massachusetts, at the age of 60.

Tom O'Brien is an American actor since the age of sixteen, having first trained at the American Conservatory Theatre in San Francisco, where he took to the stage in ACT's mainstage productions of The Holdup; A Midsummer Night's Dream as Puck, opposite Annette Bening; Dial M for Murder; The Sleeping Prince; The Lower Depths; Horton Foote's 1918 and A Christmas Carol. Other stage appearances include Da Carravaggio in New York, at the Manhattan Class Company; A Dog Called Bitch at the 2004 Vancouver Fringe Festival; and School Inc., also in Vancouver, British Columbia.

O'Brien's feature film acting credits include his feature film debut The Big Easy; as well as The Accused, (1989 Winner Academy Award Best Actress - Jodie Foster); Physical Evidence; The Astronaut's Wife; Flashback; Satisfaction and Facade. His television credits include Smallville; The X-Files; CSI: Crime Scene Investigation; The Perfect Husband: The Laci Peterson Story; JAG; NYPD Blue; LA Law; Timecop; The Twilight Zone; Thirtysomething; Son of the Morning Star; Love and Lies; Baby Brokers and Storm and Sorrow.

In 2004, as a Producer, O'Brien founded Irreverent Media Ltd. (IML) in Vancouver, British Columbia. IML's feature film slate includes the Edgar Allan Poe inspired thriller Poe's Light-House, based on the Richard Selzer short story Poe's Light-house from his published work 'The Doctor Stories'; the romantic comedy The Best Restaurant in the World. Ever.; and the thriller Sleeptalkers. His service production company, Vancouver based Fractious Tribes Productions has offices in Vancouver, British Columbia; Toronto, Ontario and Halifax, Nova Scotia. Fractious Tribes Production's projects include Irreverent Media's Sleeptalkers.

In 2007, O'Brien and Vancouver based Benefic Group principal John Bromley established the public Canadian charitable organization Whole World Foundation (w²f). Through its Whole World Fund, w2f invests in a wide range of entertainment projects that foster and support stories which also create awareness of the real issues that shape our lives. Through its efforts w²f supports benevolent organizations throughout the world.

Thomas J. (Tom) O'Brien (February 20, 1873 - February 3, 1901) was an infielder/outfielder who played in Major League Baseball from 1897 through 1900. O'Brien was born in Verona, Pennsylvania. It is unknown whether he threw and batted left or right handed.

A valuable utility man, O'Brien was able to play all positions except pitcher and catcher. He reached the majors in 1897 with the Baltimore Orioles, spending one and a half years with them before moving to the Pittsburgh Pirates (1898), New York Giants (1899), and again with Pittsburgh (1900). His most productive season came in 1899 with the Giants, when he posted career-highs in batting average (.297), home runs (6), RBI (77), runs (100), and games played (150).

In a four-season-career, O'Brien was a .278 hitter (436-for-1569) with 10 home runs and 229 RBI in 427 games.

O'Brien died in Phoenix, Arizona at the age of 27.

Born in Burbank, California, Tom O'Brien began his acting career in 1983 at San Francisco's American Conservatory Theatre, as a student of the conservatory and member of the acting company. His stage debut was Marsha Norman's "The Holdup." Other stage credits include "Mass Appeal"; "A Midsummer Night's Dream", as Puck; "The Sleeping Prince" with 'Annette Bening'; "1918"; "The Lower Depths"; and "Da Carravaggio", with Manhattan Class Company, in New York. Feature credits include Astronaut's Wife, The (1999), Big Easy, The (1987), Accused, The (1988), Flashback (1990), Facade (2000), and Physical Evidence (1989). Television credits include Beltway, The (2005) for USA Network, with Charles S. Dutton, and a recurring role on WB's "Smallville" (2001), as Journalist Roger Nixon. Guest Star turns include "Stargate SG-1" (1997), "Dead Zone, The" (2002), "CSI: Crime Scene Investigation" (2000), "X Files, The" (1993), "JAG" (1995), "Men" (1989), Strange World (1999) (TV), "NYPD Blue" (1993), "Philly" (2001), "Dark Skies" (1996), "Early Edition" (1996), "L.A. Law" (1986), "Timecop" (1997), "Strip, The" (1999), and "thirtysomething" (1987). TV films include the ABC mini-series Son of the Morning Star (1991) (TV); NBC's Baby Brokers (1994) (TV); CBS's Love and Lies (1990) (TV), and Lifetime's Storm and Sorrow (1990) (TV). As a producer, O'Brien founded both Irreverent Media Ltd. (IML) in Vancouver, British Columbia, and Fractious Tribes Productions (FTP) with offices in Halifax, Nova Scotia; Toronto, Ontario; and Vancouver, British Columbia IML's feature projects include the historical thriller "The Light-house" aka "Poe's Light-house"; magical romantic comedy "The Best Restaurant in the World. Ever."; and the thriller "Sleeptalkers". Fractious Tribes projects in development include the sci-fi fantasy feature, "Gone Green" and the television mini-series "Coordinates". In 2007 O'Brien co-founded Whole World Foundation, which invests in socially relevant feature film entertainment and earmarks profits for benevolent organizations which make a difference.