Oneworld (marketed as oneworld; CRS: *O) is an airline alliance founded on 1 February 1999. The alliance's stated objective is to be the first-choice airline alliance for the world's frequent international travelers. Its central alliance office is currently based in New York, New York, in the United States. Its member airlines include Air Berlin, American Airlines, British Airways, Cathay Pacific, Finnair, Iberia, Japan Airlines, LAN Airlines, Malaysia Airlines, Qantas, Qatar Airways, Royal Jordanian, S7 Airlines, SriLankan Airlines and TAM Airlines, plus some 30 affiliated airlines. As of 31 March 2014, Oneworld is the third largest global alliance in terms of passengers with 512.8 million passengers, behind Star Alliance (637.6 M) and SkyTeam (588 M). Its slogan is "An alliance of the world's leading airlines working as one."

Oneworld is an international airline alliance.