IOC (disambiguation)
- IBM Open Class
- Icon of Coil
- Immediate or cancel
- Index of coincidence
- Indian Ocean Commission
- Indian Oil Corporation
- Indian Orthodox Church
- Indicator of compromise
- Initial operating capability
- Initiative on Cities
- Initiatives of Change
- Intergovernmental Oceanographic Commission
- International Olive Council
- International Olympic Committee
- International Order of Characters
- International Ornithologists' Union
- Intraoral camera
- Inversion of control
- Iron Ore Company of Canada
- Italian organized crime