Geykoca is a village in Mecitözü District, in Çorum Province, Türkiye. Geykoca lies at 868 m above sea level, in the Kırlar Dağı mountains. It has 248 inhabitants. The nearest city is Çorum, 30 km to the west. Among the landmarks around are Sapinuwa (28 km) and Çorum Archaeological Museum (30 km).