MHHS

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