Mahmutlu is a village in Boyabat District, in Sinop Province, Türkiye. Mahmutlu lies at 287 m above sea level, in the Küre mountains. It has 130 inhabitants. The nearest city is Boyabat, 11.0 km to the west. Among the landmarks around are Boyabat Dam (14.4 km), Dodurga Dam (9.8 km) and Boyabat Castle (12.7 km).