| Abbreviation | Definition |
|---|---|
| ISG | Infinite Sword Glitch |
| ITOE | Is This On Easy |
| IW | Ice Witch |
| IW | Immortal Warriors |
| IW | Individual Weapon |
| IWBTG | I Wanna Be the Guy |
| J | jack(in playing cards) |
| J | Jigsaw |
| JABBA | Just Another Better Barrel Attempt |
| JAMG | Just Another Marble Game |
| JFG | Jet Force Gemini |
| JFK | Just For Kill |
| JFRPG | Japanese Fantasy Roleplaying Game |
| JGC | Japan Gaming Congress |
| JGL | Jungler |
| JKG | jamaican king gaming a youtuber |
| JLFTAG | Jordan Loves Fable Three and Gotye/video |
| JP | Job Points (video) |
| JRGS | Johnny Reb Gaming Society |
| JRPG | Japanese Role-Playing Game |