Timmerman Hill is a mountain in Greene County, New York, in the Catskill Mountains, lying southeast of Lawrenceville, with Bethel Ridge to the north and Vedder Mountain to the north-northeast. It is one of the many named elevations that shape the Catskills’ folded terrain and closely spaced ridges. Its significance here lies in its place within that mountain landscape and in its relation to nearby summits, rather than in any dimensions or recorded historical events.