| Acronym | Definition |
|---|
| FKS | Friedrich Karl Schroeder (German computer company) |
| FKS | Find and Kill String |
| FKS | Frequency Key Shifting |
| FKS | Formula Kart Stars (UK) |
| FKS | Fontenay Karaté Shotokan (French martial arts school) |
| FKS | Feuerwehr Koordination Schweiz (German: Fire Coordination Switzerland; Bern, Switzerland) |
| FKS | Fréjus Kite Surf (French kitesurfing association) |
| FKS | Fraksi Keadilan Sejahtera (Indonesian: Keadilan Sejahtera Party) |
| FKS | Formalin-Killed Spherules |
| FKS | Fudbalski Klub Sarajevo (Football Club Sarajevo, Bosnia and Herzegovina) |
| FKS | Foster Kennedy Syndrome |
| FKS | Freed Kamaiya Society (est. 2002; Nepal) |