| Abbreviation | Definition |
|---|---|
| IODA | International Optimist Dinghy Association |
| IODT | Institute Of Defense Techniques |
| IOG | Istanbul Orienteering Group |
| IOGP | International Outboard Grand Prix |
| IOP | Independent Olympic Participant |
| IOS | International Online Soccer |
| IP | Innings Pitched |
| IPA | Individual Practice Association |
| IPA | International Powerlifting Association |
| IPBA | International Power Boat Association |
| IPC | International Parachuting Commission |
| IPC | International Paralympic Committee |
| IPDP | International Player Development Program |
| IPG | Independant Players Guild |
| IPL | Indian Panga League |
| IPL | Indian Players League |
| IPL | Indian Premier League |
| IPL | Internet Premier League |
| IPO | Initial Player Offering |
| IPQ | Ingenious Personality Quiz |