ID

• 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

• 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"

Music

Albums

• I.D. (album), 1989, 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

Performers

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

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

• 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

• International dollar, common name for the Geary-Khamis dollar, a hypothetical unit of currency

• 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

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 superego psychic apparatus defined in Sigmund Freud's structural model of the psyche

• (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)