Deer Mountain is a summit in New York’s Adirondack Mountains in Herkimer County. Located in the Town of Webb, it rises north of Little Rapids and is part of a cluster of nearby peaks that includes Greenfield Mountain to the northwest, Summit Mountain to the southwest, and Mount Electra to the south-southeast. Its significance lies in its place within the Adirondack landscape and in the local geography of this section of Herkimer County.