Wittenberg Mountain is a mountain located in Ulster County. The mountain is part of the Burroughs Range of the Catskill Mountains. Wittenberg is flanked to the southwest by Cornell Mountain and to the northeast by Terrace Mountain. 

Wittenberg Mountain stands within the watershed of Esopus Creek, which drains into the Hudson River, and into the New York Bay. The northwest and northeast slopes of Wittenberg Mtn. drain into Woodland Creek, thence into Esopus Creek. The southeast side of Wittenberg drains into Wittenberg Brook, thence into Maltby Hollow Brook, Bush Kill, and Esopus Creek at Ashokan Reservoir.  Wittenberg Mountain is within the Slide Mountain Wilderness of New York's Catskil State Park. The Long Path, a 350-mile (560 km) long distance hiking trail from New York City to Albany, is contiguous with the section of the Burroughs Range Trail crossing the summits of Slide, Cornell, and Wittenberg. Wittenberg Mountain is one of the 35 peaks in the Catskills greater than 3,500 feet elevation, and is a required ascent for membership in the Catskill Mountain 3500 Club.