There have been a number of things known as The Source:

• The Source (novel) is a 1967 novel by James A. Michener.
• In the fictional television series Charmed, The Source (Charmed) is an evil being.
• The Source (service) was also the name of an early on-line service.
• The Source (magazine) is a magazine of hip-hop music and culture.
• The Source is also a 1999 documentary movie about the Beat Generation.
• The Source is the overarching entity in the machine city of the Matrix universe.