Košarkaški klub Zadar, commonly referred to as KK Zadar or simply Zadar, is a men's professional basketball club based in Zadar, Croatia. The club is a founding member and shareholder of the Adriatic Basketball Association, and competes in the ABA League and the Croatian League.

Krešimir "Krešo" Ćosić was a Croatian-Yugoslavian professional basketball player and coach. He was a collegiate All-American at Brigham Young University. He revolutionized basketball in Yugoslavia and was the first basketball player in the world to play all five positions.