Clum Hill is a mountain in New York’s Catskill Mountains in Greene County, south of Tannersville. It lies among nearby Catskill peaks, with Parker Mountain to the north-northwest and Roundtop Mountain to the southeast. Its significance is chiefly geographic: as one of the named elevations in this closely grouped landscape of ridges and summits, it helps define the terrain around Tannersville and forms part of the broader eastern New York mountain setting.