Sini Creek () is a creek in Mersin Province, south Turkey.
The headwaters are in Toros Mountains to the south of Yarmasu village of Gülnar ilçe, where it is called Kazñklñ Dere. In the northern part of Bozyazñ ilçe the creek is named Gökdere. With tributaries in Dereköy and Kñzñlca, it flows south. The creek features a waterfall around the ruins of a medieval-age monastery named Karamanastñr, after which there are a number of artificial ponds and a low power (0.42 MW) hydroelectric plant. The creek's mouth discharges into the Mediterranean Sea within the Bozyazñ ilçe center.