Waller is a city in Texas, United States, partly in Waller County and partly in Harris County within the Houston–Cypress metropolitan area. Its population was 2,682 at the 2020 U.S. census. The Waller area is located along U.S. Route 290 41 miles (66 km) northwest of downtown Houston.

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.