Rounds Mountain, , is a prominent peak in the Taconic Mountains of western Massachusetts and adjacent New York. The west side of the mountain and summit are located in New York; the east side is located within Massachusetts. The summit a bald; the slopes are wooded with northern hardwood tree species. It is notable for its views of the Hudson River Valley to the west and the Green River and Kinderhook Creek valleys of Hancock, Massachusetts to the east. The Taconic Crest Trail traverses the mountain. Much of the upper slopes and summit are within protected conservation land.