Sini Creek (Turkish: Sini Çayı) is a creek in Mersin Province, south Turkey.
The headwaters are in Toros Mountains to the south of Yarmasu village of Gülnar ilçe (district) where it is called Kazıklı Dere.[1] In the northern part of Bozyazı ilçe the creek is named Gökdere. With tributaries in Dereköy and Kızılca it flows to south.[2] After a waterfall around the ruins of a medieval-age monastery named Karamanastır, there are a number of artificial ponds and a low power (0.42 MW) hydroelectric plant.[3] The creek discharges to Mediterranean Sea at 36.0989°N 32.9733°W within Bozyazı ilçe center.