| Abbreviation | Definition |
|---|---|
| IGZ | International Gaming Zones |
| IGZ | Internet Gaming Zone |
| IHG | I Have Games |
| IMC | Inter-MUD (Multi-User Domain) Communications |
| IMGA | International Mobile Gaming Awards |
| IMGL | Indian Mobile Gaming League |
| IMGL | International Masters of Gaming Law |
| IMS | Intelligent Munitions System |
| IN | Imperishable Night |
| INDEV | In Development |
| INN | the ImagiNation Network |
| INVIS | Invisible |
| INWO | Illuminati New World Order |
| IPK | Irish Pub Killers |
| IRO | Intelligence Recon Operative |
| IRS | International Rongdoing Society |
| IRTC | Internet Ray Tracing Competition |
| IS | Insta |
| ISCG | Institute for the Study of Commercial Gaming |
| ISDG | International Society of Dynamic Games |