Campbell County High School is a public secondary institution (grades 9–12) located in Gillette, Wyoming, United States.

On December 5, 1998, Cheryl Trover, a math teacher at Campbell County High School, kidnapped and tied up her children, shot her husband John Trover with a .22-caliber pistol, and stabbed him to death with a hunting knife.

She had stolen the gun from her lover of four years, John Riley, the principal at the same school.

She then set fire to her pickup truck and lied to police about who committed her planned crimes.

[5] The events, including scenes in the high school, were dramatized in the crime story TV shows Redrum and Murderous Affairs.