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
 
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)
 
See also
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