Omladinski košarkaški klub Konstantin (Serbian Cyrillic: Омладински кошаркашки клуб Константин), commonly referred to as OKK Konstantin or simply Konstantin, is a men's professional basketball club based in Niš, Serbia.

They are currently competing in the Second Basketball League of Serbia.

Konstantin plays their domestic home games at the Čair Sports Center, located in Niš.

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