# Source

Source may refer to:

## Research

* Historical document
* Historical source
* Source (intelligence) or sub source, typically a confidential provider of non open-source intelligence
* Source (journalism), a person, publication, publishing institute or other record or document that gives information
* Source document, a document in which data collected for a clinical trial is first recorded
* Source text, in research (especially in the humanities), a source of information referred to by citation
** Primary source, a first-hand written evidence of history made at the time of the event by someone who was present
** Secondary source, a written account of history based upon the evidence from primary sources
** Tertiary source, a compilation based upon primary and secondary sources
* Sources (website), a directory of expert contacts and media spokespersons
* Open source, a philosophy of dissemination of intellectual products

## Law

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

## Mathematics and physics

* Sources and sinks a general mathematical analogy used in science
* Source of a morphism
* Source, a point where the divergence of a vector field is positive
* Source of a representation, in finite group theory
* Source, a terminal in a field-effect transistor
* Current source, an electrical or electronic device that delivers or absorbs electric current
* Energy sources, substances or processes with high concentrations of energy
* Ion source, a device that creates atomic and molecular ions
* Light source, an object emitting light
* Point source, a single identifiable localised source of something
* Radioactive source, a known quantity of a radionuclide which emits ionizing radiation
* Sound source, an object emitting sound
* Voltage source, any device or system that produces an electromotive force between its terminals

## Computing and technology

* Source (command), a UNIX command to execute commands from a file
* Communication source, objects which encode message data and transmit the information
* Source code, a file containing code for software written in a programming language
* Source theory, any process that generates successive messages in information theory
* Source (programming language), a family of sublanguages of JavaScript to support Structure and Interpretation of Computer Programs, JavaScript Adaptation

## Earth and life sciences

* Inflow (hydrology), the source of the water in a lake
* Source (hydrology), the original point from which a river or stream flows
* Source rocks, rocks that have generated, or are capable of generating hydrocarbons
* Source tissue, plant tissue serving as a source of nutrients; for example see Somatic embryogenesis

## Art and entertainment
### Fictional entities

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

### Games

* Source (game engine), a game engine developed by Valve
** Source 2, the successor to Source
* Counter-Strike: Source, a 2004 complete remake of Counter-Strike using the Source game engine
* Day of Defeat: Source, a 2005 complete remake of Day of Defeat using the Source game engine

### Music

* Source (album), a 2020 album by Nubya Garcia, or the title song
* "Source", a song by Tycho from his 2016 album Epoch

### Periodicals

* Source (lifestyle magazine), a bi-monthly magazine published by the John Lewis Partnership
* Source (photography magazine), a quarterly photography magazine

### Visual arts

* Source (1/3), public artwork by U.S. artist Tony Smith

## Organizations

* Source (UNSW), a community service provider that used to operate at the University of New South Wales in Sydney, Australia
* Source Family (1922–1975), a commune outside of 1970's Hollywood
* Source Vagabond Systems, an Israeli manufacturer using the brand "SOURCE"

## Places

* natural spring
* headwaters
* Les Sources (English: Sources), Estrie, Quebec, Canada; a regional county municipality
* Des Sources station (English: Sources station), Montreal, Quebec, Canada; a light rail station
* Boulevard Des Sources (English: Sources Boulevard), Montreal, Quebec, Canada; a large street

## Other uses

* Operation Source, a series of attacks on German warships in 1943
* Absolute (philosophy), or the source, as the absolute principle of being