Morristown High School (or MHS) is a four-year public high school serving students in ninth through twelfth grades from three communities in Morris County, New Jersey, United States, operating as part of the Morris School District. The school serves students from Morristown and Morris Township, along with students from Morris Plains, who attend the district's high school as part of a sending/receiving relationship with the Morris Plains Schools. The school has been accredited by the Middle States Association of Colleges and Schools Commission on Secondary Schools since 1952.