IDL may mean: General International Date Line, the time zone date boundary Intermediate density lipoprotein John F. Kennedy International Airport, from when it was named "Idlewild Airport" ("IDL" IATA airport code) International Drivers License International Darts League, a defunct major darts tournament IDL Drug Stores, a now-defunct independent drug store cooperative Computer Science Interface description language, any computer language used to describe a software component's inter… (More on Idl)