Körfez SK, formerly Kocaeli Birlik Spor, is a Turkish sports club from Körfez, Kocaeli Province. After five years playing non-league football, the club gained a place back in the Third League for the 2007âÂÂ08 season. That year they gained another promotion. From the 2008âÂÂ09 season, the team has competed in the TFF Second League 1st group.
In 2010, the club was renamed from Körfez Belediyespor to Körfez SK.