Old Rochester Regional High School (often referred to as ORR, ORRHS, or OR) serves the towns of Marion, Mattapoisett, and Rochester.

The school was originally built in 1961 and underwent a major renovation beginning in 2001.

This project added the auditorium and combined the high school with the adjacent Old Rochester Regional Junior High School.

Instead, it was built in Mattapoisett, with its fields leaking into Marion, Massachusetts.

ORRHS is a part of the Old Rochester Regional School District.