Duff Hill () at , is the 78th-highest peak in Ireland on the Arderin scale, and the 97th-highest peak on the Vandeleur-Lynam scale. Duff Hill is in the middle section of the Wicklow Mountains, in County Wicklow, and is part of the large massif of Mullaghcleevaun , which lies to its south. Gravale, which is tall, lies to its immediate north.