Çaybaşı is a village in Boyabat District, in Sinop Province, Türkiye. Çaybaşı lies at 915 m above sea level, in the Ilgaz mountains. It has 120 inhabitants. The nearest city is Boyabat, 15.1 km to the east. Among the landmarks around are Boyabat Castle (13.8 km) and Saraydüzü Dam (11.8 km).