Hallettsville High School is a public high school located in the city of Hallettsville, Texas, USA, and classified as a 3A school by the University Interscholastic League. It is a part of the Hallettsville Independent School District located in central Lavaca County. In 2015, the school was rated "Met Standard" by the Texas Education Agency.
The Hallettsville Brahmas compete in volleyball, cross country, American football, basketball, powerlifting, golf, tennis, track, baseball and softball.