Omladinski košarkaški klub Beograd (Serbian Cyrillic: Омладински кошаркашки клуб Београд), commonly referred to as OKK Beograd, is a men's professional basketball club based in Belgrade, Serbia. They are currently competing in the Basketball League of Serbia. It is part of the multi-sports Belgrade-based sport club OSD Beograd. The club is the league affiliate of Mega Basket.