The Old Somersworth High School, also formerly the Hilltop Elementary School, is a historic school building at 17 Grand Street in Somersworth, New Hampshire. It is a three-story brick Georgian Revival building, constructed in 1927 on the site of New Hampshire's oldest high school. It was designed by Charles Greely Loring, and served as a high school until 1956 and an elementary school until 2007. The building was listed on the National Register of Historic Places in 2015.