Thornton High School is the name of numerous high schools in the United States, including:
Thornton High School (Colorado) in Thornton, Colorado Thornton Township High School in Harvey, Illinois Thornton Fractional South High School in Lansing, Illinois Thornton Fractional North High School in Calumet City, Illinois Thornton High School in the Jefferson Union High School District in Daly City, California Thornton High School (Iowa), a defunct high school in Thornton, Iowa