| Acronym | Definition |
|---|
| IL | Illinois (US postal abbreviation) |
| IL | Israel (top level domain) |
| IL | Independent Living |
| IL | International League (AAA minor league) |
| IL | International Law |
| IL | Index List |
| IL | Information Literacy (research instruction) |
| IL | Intermediate Language |
| IL | Ignore List |
| IL | Intermediate Level |
| IL | Integrated Logistics |
| IL | Insertion Loss |
| IL | Interleukin (cytokine) |
| IL | Integrated Learning |
| IL | Ilyushin (Russian aircraft designer) |
| IL | Integrity Level |
| IL | Indicator Light |
| IL | Ionic Liquid |
| IL | Idrettslag (Norwegian: Sports Club) |
| IL | International Logistics |
| IL | Inner Loop (Beltway) |
| IL | Italian Lira |
| IL | Independent Laboratory |
| IL | Intermediate Location (US DoD) |
| IL | Installation Location |
| IL | Infralimbic Cortex (brain) |
| IL | Inside Linebacker (football) |
| IL | Interference Lithography |
| IL | Instruction List |
| IL | Injured List |
| IL | Instructional Leader |
| IL | Iron Loss |
| IL | Indirect Labor |
| IL | Interaction Level |
| IL | Identification List |
| IL | Instructional Literature |
| IL | Isthmian League (British Soccer League) |
| IL | Invert Level (civil engineering) |
| IL | Installation and Logistics |
| IL | Intact Loop |
| IL | Investigatory Leave |
| IL | Ignitor Light |
| IL | In-rush Limiter |
| IL | Immersible Light |