Sibagat, officially the Municipality of Sibagat, is a 1st class municipality in the province of Agusan del Sur, Philippines. According to the 2020 census, it has a population of 33,957 people. Located at the northernmost of the province, the town is called as the "Gateway to Agusan del Sur" and "The Last Frontier of Agusan del Sur, "and the newest town in Agusan del Sur."