IDL

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

 * 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