Butler County is a county of the U.S. state of Alabama. Its name is in honor of Captain William Butler, who was born in Virginia and fought in the Creek War, and who was killed in May 1818. As of 2000 the population was 21,399. Its county seat is Greenville.

Butler County was formed from Conecuh County, Alabama, and Monroe County, Alabama, by an act passed December 13, 1819, by the Legislature while in session at Huntsville. This was the first session of the Legislature of Alabama as a State. The name of Fairfield was first proposed for this county, but was changed on the passage of the bill to Butler, in honor of Captain William Butler. The exact date of the first settlement made by white people in the limits of Butler County is not exactly known. Some records have it as early as 1814, but the earliest settler of no dispute is James K. Benson,