Old Monroe School House

Old Monroe School House is located in the Monroe section of Hardyston Township, Sussex County, New Jersey, United States. The schoolhouse was built in 1819 and was added to the National Register of Historic Places on August 12, 1977.

The building is owned by the Hardyston Heritage Society and is open to the public as a period education museum. It is usually open to the public on the first Sunday of the months of June through September.