# ID

ID or its variants may refer to:
* Identity document, a document used to verify a person's identity
* Identifier, a symbol which uniquely identifies an object or record

## People

* I. D. Ffraid (1814–1875), Welsh poet and Calvinistic Methodist minister
* I. D. McMaster (1923–2004), American assistant district attorney
* I. D. Serebryakov (1917–1998), Russian lexicographer and translator

## Places

* İd or Narman, a town in Turkey
* Idaho, US (postal abbreviation ID)
* Indonesia, ISO 3166-1 alpha-2 country code "ID"
** Indonesian language, ISO 639-1 language code "ID"

## Arts, entertainment, and media
### Music

* The Id (band), an English new wave/synthpop band
* New:ID, an upcoming Filipino boy band

#### Albums

* I.D. (album), a 1989 album by The Wailers Band
* ID (Michael Patrick Kelly album), a 2017 studio album by Michael Patrick Kelly
* Id (Siddharta album), 1999
* [id] (Veil of Maya album), 2010
* ID, an album by Anna Maria Jopek
* The Id (album), a 2001 studio album by Macy Gray

#### Songs

* "ID" (song), a 2015 single by Kygo
* "I.D.", a 2004 song by Kasabian from their self-titled album
* "The I.D.", a 1998 song by Moloko from their album I Am Not a Doctor

### Periodicals

* I.D. (magazine), an American magazine focusing on Architecture, Graphic and Industrial Design
* i-D, a British fashion magazine
* Ideas and Discoveries (i.D.), a magazine covering science, with heavy interest in social science

### Television

* "I.D." (Law & Order), an episode of Law & Order
* Investigation Discovery, an American cable television channel

### Film

* I.D. (1995 film), a British film about football hooliganism
* I.D. (2012 film), an Indian Hindi drama
* The Id (film), a 2016 American thriller/horror film

### Other uses in arts, entertainment, and media

* I.D. (play), 2003 British play by Anthony Sher
* Id (comics), a manhwa by Kim Daewoo, art by A. T. Kenny'
* Id, a fictional kingdom in The Wizard of Id, an American comic strip
* iD (video game), a 1986 computer game
* Investigation Discovery, stylized as "ID", an American pay television network

## Brands and enterprises

* ID (public relations), a public relations firm
* ID Labs, an American music production and engineering team
* iD Mobile, a telephone network owned by Carphone Warehouse
* Interlink Airlines (IATA airline code ID), an airline based in Johannesburg, South Africa
* Batik Air (IATA airline code ID), an airline based in Jakarta, Indonesia
* Citroën ID, a variant of the Citroën DS car
* Volkswagen ID. series, a series of concept cars that have been promoted into production
* id Software, an American video game developer

## Finance

* International dollar, common name for the Geary–Khamis dollar, a hypothetical unit of currency
* Invoice discounting, a form of Factoring (finance) in the UK

## Politics

* Inclusive Democracy, a project that aims for direct, economic, social, and ecological democracy
* Independent Democrats, a political party in South Africa
* Identity and Democracy, a political group in the European Parliament

## Science, technology, and mathematics
### Biology and medicine

* Ide (fish), also spelled Id
* Infectious disease
* Infectious dose
* Insomnia disorder
* Intellectual disability, a generalized neurodevelopmental disorder

### Computing

* Id (programming language), a parallel functional programming language
* iD (software), an editor for OpenStreetMap geodata
* id (Unix), a command to retrieve group and user identification
* .id, the Internet Top Level Domain code for Indonesia
* id, the generic object datatype in the Objective-C programming language
* Instruction decoder, a decoder in CPUs
* Internet Draft, a working document of the IETF

### Design and engineering

* Industrial design, a process of designing products for mass production
* Information design, the practice of presenting information in a way that fosters understanding
* Inside diameter, also 'inner diameter' or 'I.D.'; a dimension commonly used to specify the size of tubing or pipe
* Interaction design, the practice of designing interactive digital products, environments, systems, and services
* Interior design, the art and science of enhancing the interior of a building
* Instructional design, the study of creating better instructional experiences

### Mathematics

* Identity function, a function that always returns the same value that was used as its argument
* Influence diagram, a graphical and mathematical representation of a decision situation
* Icosidodecahedron, a uniform polyhedron

### Psychology

* Id, one of the Id, ego and super-ego psychic apparatus defined in Sigmund Freud's structural model of the psyche

## Other uses

* (law) Id., Latin, short for idem (translation: "the same"), used in legal citations to refer to the previous citation
* (linguistics) Indonesian language (ISO 639-1 code "id"), a standardized register of Malay
* (linguistics) Id (cuneiform), a common-use sign in cuneiform texts
* (philosophy) Intelligent design, a pseudoscientific argument for the existence of God
* (sports) ID (classification), a Paralympic rowing classification
* A US Navy hull registration number prefix: Identification number (ID)