Sibagat is a first class municipality in the province of Agusan del Sur, Philippines. According to the 2010 census, it has a population of 30,985 people. The town is 29 kilometres (18 mi) away from Butuan City.
The word Sibagat is from the word "bagat" which means meet or meeting place. According to the oral history, the river near Sibagat which is also called Sibagat River is the place where the warring tribes meet and fight. Sibagat River is tributary of a bigger river, the Wawa river. The losing tribe would retreat downstream to the Wawa River and disappear.
Sibagat is politically subdivided into 24 barangays namely; Afga, Anahawan, Banagbanag, Del Rosario, El Rio, Ilihan, Kauswagan, Kioya, Magkalape, Magsaysay, Mahayahay, New Tubigon, Padiay, Perez, Poblacion, San Isidro, San Vicente, Santa Cruz, Santa Maria, Sinai, Tabon-tabon, Tag-uyango, Villangit, and Kolambugan.