| Abbreviation | Definition |
|---|---|
| SKI-USF | Shotokan Karate International-United States Federation |
| SKKB | Samurai Karate Klub Bregenz |
| SKO | Sport Karate Open |
| SKU | Shotokan Karate Union |
| SKU | Slovak Karate Union |
| SKVA | Shotokan Karate Vereniging Amstelveen |
| SKVA | Shotokan Karate Vereniging Amstelveen (Dutch: Shotokan Karate Association Amstelveen; Netherlands) |
| SSK | Seishin do Shukokai Karate |
| SSKA | Southern Shotokan Karate Association |
| SSKI | Seishinkai Shotokan Karate International |
| STKF | Swiss Traditional Karate Do And Kobudo Federation |
| TKA | Tompkins Karate Association |
| TKC | Team Karate Centers |
| TKF | Traditional Karate Federation. Inc. |
| TSKC | Tairyoku Shotokan Karate Club |
| TSKC | Thanet Shotokan Karate Club |
| TSKC | Traditional Shotokan Karate Clubs |
| TWSK | The Woodlands Shotokan Karate |
| TWSK | The Woodlands Shotokan Karate-Do |
| TYKI | Titusville Yoshukai Karate International |