Waller County is a county in the U.S. state of Texas. As of the 2020 census, its population was 56,794. Its county seat is Hempstead. The county was named for Edwin Waller, a signer of the Texas Declaration of Independence and first mayor of Austin.

Hempstead is a city in and the county seat of Waller County, Texas, United States, part of the Houston–The Woodlands–Sugar Land metropolitan area.