Well you have not told me that in which reference of context you want to know the full form of the IOC

Below I have given you some full forms for the IOC so you can have a look



IOC International Olympic Committee
IOC Intergovernmental Oceanographic Commission (UNESCO)
IoC Inversion of Control (OOP pattern)
IOC Input/Output Controller
IOC Initial Operational Capability
IOC Initial Operating Capability
IOC Invasion of Chaos (gaming)
IOC International Oceanographic Commission
IOC Indian Ocean Commission
IOC Immediate or Cancel (trade order)
IOC International Oil Company
IOC Indian Oil Corporation, Ltd
IOC Independent Operating Company
IOC Institute of Organic Chemistry (China)
IOC Industrial Operations Command
IOC Inorganic Chemical
IOC Images-On-Call (teleradiology system)
IOC Information Operations Center
IOC International Ozone Commission
IOC Integrated Oil Company
IOC Integrated Optical Circuit
IOC Intraoperative Cholangiogram
IOC Initial Operational Clearance
IOC Inter-Office Channel
IOC Institute of Carpenters
IOC Inorganic Compound
IOC Interoffice Channel
IOC Index of Cooperation (ITU-T)
IOC Instructor Orientation Course (SCUBA PADI course)
IOC In-Orbit Checkout
IOC Internet Operations Center (IETF)
IOC ISDN Ordering Code (Bellcore)
IOC Infantry Officers' Course (USMC)
IOC Input/Output Cluster (Cray)
IOC Inter Office Communications
IOC Islam on Campus
IOC Independent Operating Carrier
IOC Instantaneous Overcurrent
IOC IOTA Occultation Camera (International Occultation Timing Association)
IOC Interfaith Open Communities
IOC Islamic Observation Centre
IOC Individual Oral Commentary
IOC Information Object Class
IOC INTELSAT Operations Center
IOC Internet Operation Center
IOC Inter-Organizational Coordination
IOC Integrated Optical Component
IOC Intercept Operations Center
IOC Innocent Owner/Operator Certificate
IOC Innovation Ontario Corporation (Government of Ontario Corporation)
IOC Impact Over Cost
IOC In-Orbit Construction (NASA)
IOC In-Organic Chemical
IOC Intrinsic Order Criterion
IOC Involuntary Outpatient Civil commitment
IOC Input Output Cabinet
IOC Intercell Ohmic Contact
IOC International Obesity Congress
IOC Internal Office Communication
IOC Internal Overload Control
IOC Índice de Oscilación Austral (Spanish: Southern Oscillation Index)
IOC Inspector on Call
IOC Internal Office Code
IOC Interactive Orbit Calculator
IOC Inter-Object Concurrency
IOC International Outsourcing Company (Tunisia)
IOC Iraqi Olympic Committee
IOC Indicator of Compromise
IOC Integrated Operations Center (various organizations)
IOC Imitation of Christ