Bayugan is a city in the province of Agusan del Sur, Philippines. It has a population of 99,361 according to the census of 2010. The city is classified as a fifth class city according to Philippine Statistics Authority (Republic Act No. 7160). Being the only city in the 1st Congressional District and the only city in the province of Agusan del Sur, Bayugan serves as the growth center of the province.