KK Proleter Zrenjanin

Košarkaški klub Proleter (), commonly referred to as KK Proleter Zrenjanin, is a men's professional basketball club based in Zrenjanin, Serbia. They currently participates in the Second Basketball League of Serbia. The club is also known as Proleter Naftagas due to sponsorship reasons. They are the only club in Serbia outside Belgrade which won a national title.
History.
Formed in 1947, they immediately became one of the leading clubs in the Yugoslavia. In the 1948 season, just one year after its establishment, the club won second place in the national championship. They also finished runners-up in 1952 and 1955, before finally won the national title in the 1956 season. At the time, the club has a notable starting five consisted of players Vilmos Lóczi, Lajos Engler, Dušan Radojčić, Ljubomir Katić, and Milutin Minja.
After more than a decade playing in the lower leagues, the club participated in the Basketball League of Serbia from 2009 to 2012.
Sponsorship naming.
KK Proleter has had several denominations through the years due to its sponsorship: