MHHS may refer to: Mundaring and Hills Historical Society in Mundaring, Western Australia, Australia
Schools Medicine Hat High School, Medicine Hat, Alberta, Canada Morris Hills High School, Rockaway, New Jersey, United States Mountain Home High School (Arkansas), Mountain Home, Arkansas, United States Mountain Home High School (Idaho), Mountain Home, Idaho, United States Mt. Hope High School, Bristol, Rhode Island, United States Mission Hills High School, San Marcos, California, United States Mountain House High School, Mountain House, California, United States