All-4-One is an American male R&B/pop group best known for their cover hit single "I Swear" from their self-titled 1994 debut album. The group comprises Jamie Jones, Delious Kennedy, Alfred Nevarez, and Tony Borowiak, all from the Antelope Valley and Mojave, California areas, but are based in the Los Angeles area. The group has sold 22 million records worldwide.

All for One or All 4 One may refer to:

• One for all, and all for one (Unus pro omnibus, omnes pro uno), the motto of Dumas' Three Musketeers, and the traditional motto of Switzerland