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ID, Id, id or I.D. may refer to:

  • Identity document, any document used to verify a person's identity
  • Identifier, a symbol which uniquely identifies an object or record

Arts and entertainment[edit]

Film and television[edit]



  • Id (comics), a manhwa by Kim Daewoo, art by A. T. Kenny
  • 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
  • Id, a fictional kingdom in The Wizard of Id, an American comic strip


Other media[edit]

Businesses and organizations[edit]

Design and engineering[edit]


  • İd, a town in Turkey
  • Idaho, US (postal abbreviation ID)
  • Indonesia, ISO 3166-1 alpha-2 country code "ID"
    • .id, Internet Top Level Domain code for Indonesia

Science, technology, and mathematics[edit]

Biology and medicine[edit]



  • Influence diagram, a graphical and mathematical representation of a decision situation
  • Inside diameter, also 'inner diameter'; a dimension commonly used to specify the size of tubing or pipe
  • Identity function, a function that always returns the same value that was used as its argument


  • Id, one of the psychic apparatus defined in Sigmund Freud's structural model of the psyche
  • One of the parts of the psychic apparatus, in socionics

Other uses[edit]

See also[edit]