| Abbreviation | Definition |
|---|---|
| WJG | Waterloo Junior Golf |
| WJGA | Waterloo Junior Golf Association |
| WJGT | Worldwide Junior Golf Tour |
| WJH | Warwick Junior Hockey |
| WJHA | Warwick Junior Hockey Association |
| WJHC | World Junior Hockey Championship |
| WJKU | World Ju-Jitsu and Karate Union |
| WJL | Walter J. Long Multi Sports Complex |
| WJL | Walter Johnson League baseball tournament |
| WJM | We're Just Mean |
| WJM | Women, Juniors, and Masters |
| WJO | Women's Junior Olympic Compulsory |
| WJPW | World Japan Pro Wrestling |
| WJR | World Junior Races |
| WJRA | Western Junior Rodeo Association |
| WJRT | Wayzata Junior Racing Team |
| WJSB | Wilson Junior Soccer Club |
| WJSC | Windjammers Sailing Club |
| WJSL | Wisconsin Junior Soccer League |
| WJT | Wimbledon Junior Tennis |