Košarkaški klub Proleter (Serbian Cyrillic: Кошаркашки клуб Пролетер), commonly referred to as KK Proleter Zrenjanin, is a men's professional basketball club based in Zrenjanin, Serbia.

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.

[1][2] At the time, the club has a notable starting five consisted of players Vilmos Lóczi, Lajos Engler, Dušan Radojčić, Ljubomir Katić, and Milutin Minja.

KK Proleter has had several denominations through the years due to its sponsorship: Note: Flags indicate national team eligibility at FIBA sanctioned events.