World War III is a hypothetical successor to World War II (1939–1945).

World War III, World War Three, the Third World War, or the Fourth World War may also refer to:

• World War III (Left Behind), a rider in the Left Behind series of novels
• The Third World War (novel), a 2003 novel by Humphrey Hawksley
• The Third World War (Hackett novels), 1978 and 1982 novels by General Sir John Hackett
• "The Fourth World War", a 1999 work by Subcomandante Marcos

• World War 3 Illustrated, a political comics anthology founded in 1979
• Third World War (comics), a political comic strip appearing in Crisis beginning in 1988
• World War III (DC Comics), the title of two sagas published in superhero comic books by DC Comics beginning in 2000
• World War III (G.I. Joe), a comic book storyline published by Devil's Due Publishing beginning in 2007

• World War 3: 1976-1984, a 1975 board wargame that simulates a hypothetical war for world domination
• The Third World War (video game), for the Sega Mega-CD console
• World War III: Black Gold, a 2001 Microsoft Windows computer game
• World War 3 (video game), a 2018 game by The Farm 51

• World War III (1998 film), a 1998 German film by Robert Stone
• World War III (2022 film), a 2022 Iranian film
• WW3, a 2001 TV-movie starring Timothy Hutton and Vanessa L. Williams
• World War III (miniseries), a 1982 American TV miniseries directed by David Greene
• "World War Three" (Doctor Who), a 2005 episode of the BBC science fiction television series Doctor Who
• WCW World War 3, an annual professional wrestling pay-per-view event
  • World War 3 (1995)
  • World War 3 (1996)
  • World War 3 (1997)
  • World War 3 (1998)
• "World War III", a 1985 episode of the TV sitcom Night Court
• The Fourth World War, a 2003 documentary film

• Third World War (band), an English proto-punk band formed in 1970
• WWIII, a Los Angeles–based band fronted by Mandy Lion

• World War III (Mac album), 1999
• World War III (Madina Lake album), 2011
• WWIII (album), a 2003 album by KMFDM

• "World War III", a song by Anti-Nowhere League from We Are...The League, 1982
• "World War III", a song by Bad Religion from Bad Religion, 1981
• "World War III", a 1982 song by Exciter
• "World War III", a song by Grandmaster Flash and the Furious Five from Grandmaster Flash and the Furious Five, 1984
• "World War III", a song by the Jonas Brothers from Lines, Vines and Trying Times, 2009
• "World War III", a 1979 song by The Suburbs
• "World War Three", a 1979 song by D.O.A.
• "WW III" (song), a 2000 song by Ruff Ryders
• "WWIII", a 2020 song by Grandson from Death of an Optimist
• "WWIII", a 2020 song by Machine Gun Kelly from Tickets to My Downfall
• "WW3", a 2017 song by Paloma Faith from The Architect
• "3rd World War", a 2013 song by Jesse Jagz from the soundtrack of the film Heaven's Hell
• ”WW3”, a 2025 song by Kanye West^[a]

• World War II (disambiguation)
• WWI (disambiguation)