Jasper County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 32,980. Its county seat is Jasper. The county was created as a municipality in Mexico in 1834, and in 1837 was organized as a county in the Republic of Texas. It is named for William Jasper, an American Revolutionary War hero.

William Jasper was a noted American soldier in the Revolutionary War. He was a sergeant in the 2nd South Carolina Regiment.