İsaoğlu is a village in Boyabat District, in Sinop Province, Türkiye. İsaoğlu lies at 433 m above sea level, 0.9 km from the Küre mountains. It has 345 inhabitants. The nearest city is Boyabat, 10.9 km to the southwest. Among the landmarks around are Dodurga Dam (8.9 km) and Boyabat Castle (11.8 km).