Primary source, firsthand written evidence of history made at the time of the event by someone who was present

The Source (novel), a 1965 novel by James A. Michener

The Source, a book by Art Bell about paranormal matters

Source engine, a proprietary game engine developed by Valve Software for Half-Life 2

Source (UNSW), a community service provider that used to operate at the University of New South Wales in Sydney, Australia

Sources of international law, the materials and processes out of which the rules and principles regulating the international community are developed

The Source (magazine), a magazine of hip-hop music and culture

A SCSI endpoint

Day of Defeat: Source, a game utilizing the Source engine

Counter-Strike: Source, a game utilizing the Source engine

Current source, an electrical or electronic device that delivers or absorbs electric current

Voltage source, any device or system that produces an electromotive force between its terminals

The Source (Charmed), a fictional evil being in the television series Charmed

Source code for software, see also free software or open-source software

The Source, the overarching entity in the machine city of the Matrix universe

The Source, a character in the short-lived 1978 US television sitcom Quark

Journalism sourcing, a person, publication or other record or document that gives information

A terminal in a field effect transistor

Secondary source, written accounts of history based upon the evidence from primary sources

The Source, an album by Ali Farka Touré

Believers of the Source, a disbanded Faction of the Planescape universe

WVUR-FM, "The Source", Valparaiso University's student-run radio station

Source, an album released by the band The Duskfall in 2003.

The Source by Circuit City, a Canadian electronics store

Source (comics), a sentient entity who provides advice to the New Gods in the DC Multiverse

The Source (film), a 2002 science fiction movie, also known as The Secret Craft in the UK and The Surge for its American DVD release

The Source, a series of volumes by Graham Kendrick that are compilations of Christian church music

"The Source", a song by Built to Spill from their 1994 album There's Nothing Wrong with Love

Source text, in research (especially in the humanities), a source of information referred to by citation

Source (river or stream), the original point from which the river flows

Sources of law, the materials and processes out of which law is developed

The Source (musician), the production identity of UK electronic music record producer John Truelove

The Source (service), an online service provider founded in 1978

Tertiary source, compilations based upon primary and secondary sources

Communication source

The Source (album), an album by Grandmaster Flash & the Furious Five

The Source (network), a radio network operated in the 1970s and 1980s by NBC

Source, in hydrology, is the origin of water for a river or stream

The Source (documentary), a 1999 documentary movie about the Beat generation

Highlander: The Source, the fifth film in the Highlander franchise