IL or Il may refer to:
Businesses and organizations Image-Line, a Belgian software company International League, Class Triple-A league in North American Minor League Baseball Ilyushin, a Russian aircraft manufacturer, whose aircraft are designated with "IL" Liberal Initiative, a political party in Portugal Infinity Learn, Empowering Education, Illuminating Minds, Inspiring Learning, it is also stand for "IL" IL, the IATA airline designator of Trigana Air
Places İl, the term for 'province' in Turkey, see Provinces of Turkey Il, Iran, a village in Mazandaran Province, Iran Israel (ISO 3166-1 alpha-2 country code IL) Illinois (US postal abbreviation IL) Ilmenau, Thuringia, Germany (former vehicle plate code; newer plates use IK for Ilm-Kreis)
Science and technology Interactional linguistics, an interdisciplinary approach to grammar and interaction in the field of linguistics Interlingua de Peano, a controlled language of Neo Latin used as an auxiliary language – not to be confused with Interlingua de IALA (IA), a constructed language
Biology, chemistry, and medicine Interleukin, a family of cytokines, in biochemistry Introgression line, in plant genetics Infralimbic prefrontal cortex nucleus Ionic liquid, in chemistry including pharmaceutics, and food science
Computing .il, the Internet Top Level Domain (TLD) code for Israel Internet Link protocol, developed originally as part of Plan 9 from Bell Labs Insert Line (ANSI), an ANSI X3.64 escape sequence Instruction list, an EC 61131-3 programming language Intermediate language, in computer science Common Intermediate Language, the compiled form of .NET code Common Language Infrastructure, originally named Microsoft Intermediate Language
Sports Injured list, a list of injured baseball players Interleague play in Major League Baseball Irish League, football league in Northern Ireland
Other uses Il, king of Umma, a Sumerian king, circa 2400 BCE Il (Korean name), including a list of people with the name Il (Shugo Chara!), a character from the manga series Shugo Chara! by Peach-Pit International law IL (album), a 2016 album of French-Canadian pianist and composer Jean-Michel Blais Ugaritic spelling of the deity El IL, one way to write the Roman numeral for 49. IL, an abbreviation for the Israeli pound, the first currency of Israel Irish Language