Buol Regency is a regency of Central Sulawesi Province of Indonesia. It was created on 4 October 1999, having previously been the eastern half of a larger Buol Tolitoli Regency. It covers an area of 4,043.57 km2, and had a population of 132,330 at the 2010 Census; and 145,254 at the 2020 Census; the official estimate as at mid 2024 was 162,270. The administrative centre is the town of Buol, in Biau District.