ITL can refer to:
- Inside the Loop, a term pertaining to things inside the 610 Loop in Houston
- Ispravitelno-Trudovoi Lager, the Russian abbreviation for the correctional-labor camps (Gulag)
- In the Labyrinth, a role-playing system built on The Fantasy Trip
- Interval Temporal Logic, a temporal logic
- Iterative Template Library, a generic component library
- Italian lira, the former currency of Italy that had ISO 4217 code ITL
- Institute of Technology Law, National Chiao Tung University a law school in Taiwan
- Islamic Tools and Libraries, a subproject of Arabeyes software which provides Hijri dates, Muslim prayer times and Qibla
- Inferential theory of learning
- ITL Eisenbahngesellschaft (ITL - Import Transport Logistik) - a German private railway company based in Dresden
- Information Technology Limited, a British computer company of the 1980s (formerly CTL)