Muenster is a city in western Cooke County, Texas, United States, along U.S. Route 82. The population was 1,544 at the 2010 census. Muenster is a primarily German-Texan city.

Cooke County is a county in the U.S. state of Texas. At the 2020 census, its population was 41,668. The county seat is Gainesville. The county was founded in 1848 and organized the next year. It is named for William Gordon Cooke, a soldier during the Texas Revolution. It is a part of the Texoma region.