Old Clump Mountain is a summit in the Catskills in the towns of Stamford and Roxbury in Delaware County, New York.
Its latitude and longitude are 42°18'39" North, 074°38'07" West. Elevation 2,926 feet.
It is the location of the registered National Historic Landmark of the birthplace, boyhood and summer homes, and burial site of American naturalist and writer John Burroughs.