| Abbreviation | Definition |
|---|---|
| KCU | Korean Culture Union |
| KDU | Krio Descendants Union |
| KEO | Kammerunion Elbe Oder |
| KFCU | Keesler Federal Credit Union |
| KFTU | Korea Federation of Trade Unions |
| KFTU | Kyrgyzstan Federation of Trade Unions |
| KGU | Kent Golf Union |
| KIU | Kölner Internet Union |
| KOGU | Kambala Old Girls Union |
| KOR | Komitet Obrony Robotnikow (Committee for the Defense of Workers) |
| KPCU | Kenya Planters Cooperative Union |
| KPCU | Kingsport Press Credit Union |
| KPCU | Korean Presbyterian Churches Union |
| KPU | Kennedy Political Union |
| KSU | Kerala Student Union |
| KSWU | Karnataka Sex Workers Union |
| KU | Kansas Union |
| KU | Kerensky's Union |
| KUA | Kimball Union Academy |
| KUB | Kehr Union Building |