| Abbreviation | Definition |
|---|---|
| JUB | James Union Building |
| JUF | Jewish Union Foundation |
| JUM | Joint Union Management |
| JUPOPE | Jamaica Union of Public Officers and Public Employees |
| JUS | Killer |
| JUSAG | Judicial Union Staff Association of Ghana |
| JUTA | Jamaica Union of Travelers Association |
| JUTA | Jamaica Union of Travellers Association |
| JUTA | Jamaican Union of Travellers Association |
| JVU | Johannesburg Volleyball Union |
| JWTU | Jamaica Workers and Tradesmen Union |
| JWTU | Jamaica Workers and Transport Union |
| JWU | Jamaica Workers Union |
| KANU | Kenya African National Union |
| KAUD | Kommunistische Arbeiter-Union Deutschlands |
| KCFF | Kern County Fire Fighters |
| KCSU | King's College Student Union |
| KCTU | Korean Confederation of Trade Unions |
| KCU | Kagera Cooperative Union |
| KCU | Kohler Credit Union |