IBL
- Image-based lighting
- InBound Links
- Inbred backcross lines
- Indian Badminton League
- Indigo Bay Lodge Airport
- Indonesian Basketball League
- Industrial Bus Lines
- Inquiry-based learning
- Instance-based learning
- Intercounty Baseball League
- International Basketball League
- International Basketball League (1999–2001)
- International Brain Laboratory
- International Brotherhood of Longshoremen
- Internet slang
- Ion beam lithography
- Israel Baseball League
- Serie A1 (baseball)