may refer to:
- Source Text , in research (especially in the humanities), a source of information referred to by citation
- --- Primary Source , firsthand written evidence of history made at the time of the event by someone who was present
- --- Secondary Source , written accounts of history based upon the evidence from primary sources
- --- Tertiary Source , compilations based upon primary and secondary sources
- Source , in Hydrology , is the origin of water for a river or stream
- Source Code for software, see also free software or open-source software
- The Source (service) , an online service provider founded in 1978
- A terminal in a Field Effect Transistor
- Light Source , an object emitting light
- Sound Source , an object emitting sound
- Energy Sources , are substances or processes with high concentrations of energy
- Voltage Source , any device or system that produces an electromotive force between its terminals
- Current Source , an electrical or electronic device that delivers or absorbs electric current
- Source Engine , a proprietary game engine developed by Valve Software for ''Half-Life 2''
- ---'''', a game utilizing the Source engine
- ---'''', a game utilizing the Source engine
- A SCSI endpoint
- Communication Source
- '' The Source (documentary) '', a 1999 documentary movie about the Beat Generation
- '' 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, the overarching entity in the Machine City of the Matrix universe
- The Source (Charmed) , a fictional evil being in the television series ''Charmed''
- 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
- The Source (network) , a radio network operated in the 1970s and 1980s by NBC
- WVUR-FM , "The Source", Valparaiso University's student-run radio station
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