St. Joseph High School, also known as St. Joe's, is an independent, all-boys Roman Catholic college preparatory school located on a 70-acre (280,000 m²) site in Metuchen and Edison, New Jersey. It draws students from a wide geographic area encompassing over forty school districts and over seventy grammar schools in Middlesex, Somerset, and Union counties, as well as other outlying areas. It is located in the Roman Catholic Diocese of Metuchen.