| Acronym | Definition |
|---|
| RK | Rurouni Kenshin (anime) |
| RK | Runge-Kutta (methods; higher mathematics) |
| RK | Republic of Kazakhstan |
| RK | Roadkill |
| RK | Repair Kit |
| RK | Rose Krieger (manufacturer; various locations) |
| RK | Rama Krishna |
| RK | Road Kill |
| RK | Radial Keratotomy |
| RK | Robert Kelly (rapper) |
| RK | Raj Kapoor (Indian actor) |
| RK | Relient K (band) |
| RK | Royal Knights |
| RK | Rilo Kiley (band) |
| RK | Rukometni Klub (Croatian: Handball Club) |
| RK | Rich Kid |
| RK | Religious Knowledge |
| RK | Röda Korset (Swedish Red Cross) |
| RK | Random Key (computing) |
| RK | Roemisch Katholisch (German : Roman Catholic) |
| RK | Redlich Kwong (Thermodynamic Equation) |
| RK | Radial Keratectomy |
| RK | Komi Republic (Russia) |
| RK | Reaction Kinetic |
| RK | Rechtschaffen and Kales (sleep analyzation) |
| RK | Registered Keeper (vehicle ownership) |
| RK | Rajni Kanth (actor) |
| RK | Ritter Kreuz (German: Knight's Cross) |
| RK | Roger Kwok (Chinese actor) |
| RK | US Revenue Consular Service Fee (Scott Catalogue prefix; philately) |
| RK | Radio Kaštela (Kaštela, Croatia) |
| RK | Richmond Knights (band) |
| RK | Rynnäkkö Kivääri (Finnish: assault rifle) |