Mount Ivy is a hamlet and census-designated place in the Town of Haverstraw, in Rockland County, New York, United States.

It is located north of New City, east of Pomona, south of Thiells, and west of Garnerville.

Mount Ivy is the location where General Anthony Wayne's troops rested and concealed themselves before the assault of Stony Point fortress.

The business center of Mount Ivy is located at the northern terminus of New York State Route 45, at its junction with U.S. Route 202, approximately ¼ mile east of the Mount Ivy exit of the Palisades Interstate Parkway.

Mount Ivy is primarily served by the Pomona post office.