| Abbreviation | Definition |
|---|---|
| XP | Xtra Pain |
| XP | Xtreme Punishment |
| XPL | Xtreme Professional League |
| XPOP | Xtreme Paintball Of Palestine |
| XPW | Xtreme Pro Wrestling |
| XQ | Xtreme Quake |
| XQ2 | Xtreme Quake II |
| XQ3 | Xtreme Quake III |
| XQA | Ex Quizzer's Association |
| XQB | Former QuarterBack |
| XQK | Xylophone Quail Killers |
| XR | Xtra Roostertail |
| XR | Xtreme Racing |
| XR | Xtreme Revolution |
| XRC | Xtreme Racing Club |
| XRJ | Xtreme Rumble Junkie |
| XS | Xtreme Sport |
| XS | Xtreme Sports |
| XSN | XBox Sports Network |
| XTW | Xtreme Total Wrestling |