IBL is a three-letter acronym that may refer to:
- ibuprofen lisinate
- Image based lighting
- InBound Links -- metric used by search engines
- Inbred backcross lines
- Indonesian Basketball League, former name of the National Basketball League, the pre-eminent men's basketball league in Indonesia
- Inquiry-based learning
- Intercounty Baseball League
- International Basketball League
- International Basketball League (1999-2001)
- International Brotherhood of Longshoremen
- Ion Beam Lithography
- Italian Baseball League
- Israel Baseball League
- Instance-based learning (e.g. KNN, PEL-C, IBL-1, IBL-2 and IBL-3)
- In before lock (of a Threaded discussion)
- Involved But Looking
- Indigo Bay Lodge Airport, Mozambique (IATA code IBL)