IDL may refer to:

Computing

  • Interface description language, any computer language used to describe a software component's interface
  • IDL specification language, the original IDL created by Lamb, Wulf and Nestor at Queen's University, Canada
  • OMG IDL, an IDL standardized by Object Management Group selected by the W3C for exposing the DOM of XML, HTML, CSS, and SVG documents
  • Microsoft Interface Definition Language, an extension of OMG IDL for supporting Microsoft's DCOM services
  • Web IDL, a variation of an IDL for describing APIs that are intended to be implemented in Web browsers
  • Interactive Data Language, a data analysis language popular for science applications
  • ICAD Design Language, a knowledge-based engineering language used with the software ICAD

Places

  • John F. Kennedy International Airport, formerly named Idlewild Airport with IATA airport code IDL
  • Indianola Municipal Airport, by FAA airport code
  • Inner Dispersal Loop, the common name of Interstate 444, a highway in downtown Tulsa, Oklahoma

Other uses

  • Islamic Democratic League, a party
  • International Date Line, the time zone date boundary
  • Intermediate-density lipoprotein
  • International Drivers License
  • International Darts League, a defunct major darts tournament
  • IDL Drug Stores, a now-defunct independent drug store cooperative
  • Internet Defense League, a website