Grindstone Island Upper Schoolhouse is a historic one-room school building located on Grindstone Island, Clayton, Jefferson County, New York.

The building includes a vestibule and small teachers apartment.

Also on the property is a contributing well pump.

[2]: 5–6 It was added to the National Register of Historic Places in 2012.

This article about a historic property or district in Jefferson County, New York, that is listed on the National Register of Historic Places, is a stub.