KK Rtanj
| Rtanj | |
|---|---|
| Leagues | First Regional League of Serbia |
| Founded | 1980 |
| History | KK Rtanj (1980–present) |
| Arena | Boljevac Sports Hall |
| Location | Boljevac, Serbia |
| Team colors | Blue and White |
| President | Milan Grbović |
| Head coach | Ivan Simić |
Košarkaški klub Rtanj (Serbian Cyrillic: Кошаркашки клуб Ртањ), commonly referred to as KK Rtanj, is a men's basketball club based in Boljevac, Serbia. They are currently competing in the First Regional League of Serbia (3rd-tier).
The club was founded in 1980 and was named after Rtanj, a mountain situated in eastern Serbia.