Big Four or Big 4 may refer to:
Groups of companies
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: 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
Groups of people
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
Groups in sport
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
Other groups
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
Arts, entertainment and media
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 Power metal: Helloween, Blind Guardian, Sabaton, DragonForce 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 The Big Four (novel), by Agatha Christie, 1927 The Big 4, a 2022 Indonesian movie