Big Four or Big 4 may refer to:

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• Big Four accounting firms: Deloitte, Ernst & Young, KPMG, PwC
• Big Four (airlines) in the U.S. in the 20th century: American, Eastern, TWA, United
• Big Four (banking), several groupings of banks in different countries
• Big Four (British railway companies) in the period 1923–1947: GWR, LMS, LNER, SR
• Big Four (British broad gauge railways in Argentine) c.1900–1948: Buenos Aires and Pacific Railway, Buenos Aires Great Southern Railway, Buenos Aires Western Railway and Central Argentine Railway
• Big Four (radio networks) in the U.S.: CBS, NBC, ABC, Mutual
• Big Four Railroad, a nickname of the Cleveland, Cincinnati, Chicago and St. Louis Railway in the U.S.
• Big Four American tech companies: Apple, Amazon, Google, Meta Platforms
• Big Four television networks in the U.S.: ABC, CBS, FOX, NBC
• The "Big Four" largest UK ITV companies 1955–1968: History of ITV § The Big Four and Big Five
• Big Four state-owned car manufacturers of China, namely: SAIC Motor, FAW Group, Dongfeng Motor Corporation, and Changan Automobile
• Japanese Big Four motorcycle manufacturers: Honda, Kawasaki, Suzuki, Yamaha
• Big Four supermarkets chains in the United Kingdom: Tesco, Sainsbury's, Asda, and Morrisons
• Big Four cognac companies: Hennessy, Martell, Courvoisier, and Rémy Martin
• Big Four venue operators at the Edinburgh Festival Fringe: Assembly, Gilded Balloon, the Pleasance Theatre Trust and Underbelly

• Big Four (Central Pacific Railroad), 19th century American railroad entrepreneurs
• Big Four (debutantes), in the Chicago social scene during World War I
• Big Four (Najaf), leading Grand Ayatollahs of Twelver Shia Islam
• The Four Companions, the most loyal companions of Muhammad and Ali.
• Big Four (Scotland Yard), London detectives of about 1919
• Big Four of Maryland Thoroughbred racing, horse trainers in the 1960s–1970s
• The Big Four (Calgary), Alberta cattlemen of the early 20th century
• The Four Greats (Norwegian writers): Ibsen, Bjørnson, Lie, Kielland

• Big Four (Canadian football), a forerunner competition to the Canadian Football League East Division
• Big Four (English football) in the 2000s: Arsenal, Chelsea, Liverpool, Manchester United
• Big Four in Formula 1: McLaren, Williams, Renault (formerly Benetton), and Ferrari, from 1980s to 2008
• Big Four (Mexico), a group of the top four football clubs in Mexico: Club América, Chivas, Cruz Azul and Pumas
• Big Four (polo), an American polo team of the early 20th century
• Big Four (tennis), from 2008 to 2017: Federer, Nadal, Djokovic, Murray
• Big Four, the leading major professional sports leagues in the United States and Canada: MLB, NBA, NFL, NHL
• Big-4 League, a senior ice hockey league in Canada between 1919 and 1921

• Big Four (Western Europe): France, Germany, Italy, and the United Kingdom
• Big Four Conference, various conferences between the victorious nations after World War I and World War II
• Big Four (World War I), the four major Allied powers: United States, United Kingdom, France, Italy
• Big Four (World War II), or Four Policemen: United States, United Kingdom, China, Soviet Union
• Big Four outlaw motorcycle clubs: Hells Angels, Pagans, Outlaws, Bandidos
• Big Four international beauty pageants: Miss Earth, Miss International, Miss Universe, and Miss World
• Big Four (universities), the top four universities in the Philippines

• Big Four (band), a Hong Kong music group
• Big Four (Eurovision), the four main sponsoring countries before 2011
• Big Four (Grammy Awards) or the General Field, four standard awards
• The Big Four (fashion), the 4 most notable Vogue covers: American Vogue, British Vogue, Vogue France and Vogue Italia
• Big Four of Fashion week: Paris, Milan, London and New York
• Big Four of Britpop: Blur, Oasis, Pulp, Suede
• Big Four of Doom metal: Candlemass, Pentagram, Saint Vitus, Trouble
• Big Four of Grunge: Nirvana, Pearl Jam, Soundgarden, Alice in Chains
• Big Four of Thrash metal: Anthrax, Megadeth, Metallica, Slayer
  • The Big Four: Live from Sofia, Bulgaria a 2010 concert recording
• Big Four, a key rhythmic innovation on the marching band beat, invented by Buddy Bolden
• Big 4 (sculpture), outside the Channel 4 headquarters in London
• Big Four films of the Disney Renaissance: The Little Mermaid, Beauty and The Beast, Aladdin and The Lion King
• Marvel Comics' Big Four Avengers: Iron Man, Captain America, Thor and Hulk
• Big Four Slashers: The Texas Chainsaw Massacre, Halloween, Friday the 13th and A Nightmare on Elm Street, or their respective characters, Leatherface, Michael Myers, Jason Voorhees, and Freddy Krueger
• The Big Four (novel), by Agatha Christie, 1927
• The Big 4, a 2022 Indonesian movie

• Big Four, West Virginia, U.S.
• Big Four Bridge, connecting Louisville, Kentucky, and Jeffersonville, Indiana, U.S.
• Big Four Mountain, Washington, U.S.

• Big 4 (lottery), a game in the Pennsylvania Lottery
• Big Four (Indian snakes), four snake species responsible for the most snake-bites in India
• Big Four (White Star Line), four British ocean liners of the early 20th century
• Norton Big 4, a British motorcycle 1907–1954
• After World War I: The major allied powers (United States, United Kingdom, France, and Italy), who held separate sessions during the peace negotiations.
• After World War II: The major allied powers United States, Soviet Union, United Kingdom, and China (later France).
• The main Nazi war criminals Adolf Hitler, Heinrich Himmler, Joseph Goebbels, and Hermann Göring.

• All pages with titles beginning with Big four
• All pages with titles beginning with Big 4
• Big One (disambiguation)
• Big Two (disambiguation)
• Big Three (disambiguation)
• Big Five (disambiguation)
• Big Six (disambiguation)
• Big Seven (disambiguation)
• Big Eight (disambiguation)
• Big Ten (disambiguation)
• Big 12
• Core Four
• Fab Four
• Quadruple Alliance (disambiguation)

This disambiguation page lists articles associated with the title Big Four.
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