| Abbreviation | Definition |
|---|---|
| IAG | Inside Asian Gaming |
| IAGA | International Association of Gaming Advisors |
| IAP | In-App Purchases |
| IBFP | In Before Fighter Pilot |
| IBL | Internet Basketball League |
| IBS | Intelligent Brave Soldiers |
| ICC | IceCrown Citadel |
| ICN | International Conflictgames Network |
| ICSF | Imperial College Union Science Fiction, Fantasy and Horror Society |
| IDAP | Interactive Digital Access Program |
| IDBP | In-Depth BattlePedia |
| IDZ | Ijime Dame Zettai |
| IEC | Invisible Escape Car |
| IEM | Intel Extreme Masters |
| IF | Ironforge (World of Warcraft city) |
| IFA | Internet Football Association |
| IFCT | Italian Federation Ced Tournaments |
| IFGS | International Fantasy Gamer s |
| IFGS | International Fantasy Gaming Society |
| IGB | Illinois Gaming Board |