IOC or IoC may refer to:

Computing

• IBM Open Class
• I/O processor
• Inversion of Control, a software design pattern

Telecom

• Independent Operating Company, usually a synonym to CLEC

Game

• Invasion of Chaos, a booster pack in the Yu-Gi-Oh! Trading Card Game

Religion

• Indian Orthodox Church (IOC) officially known as Indian (Malankara) Orthodox Church

Other

• Indian Ocean Commission, generally COI, but according to World Bank as well IOC
• Icon of Coil
• Immediate or cancel, a type of order used on some stock exchanges
• Indian Oil Corporation
• Initiatives of Change
• Intergovernmental Oceanographic Commission
• International Olympic Committee
• Organized crime, acronym International Organized Crime
• Initial Operating Capability
• International Oil Company, as opposed to NOC, which stands for National Oil Company
• International Ornithological Congress
• Iron Ore Company of Canada
• Italian Organized Crime
• Independent Operating Carrier
• International Order of Characters

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