Slide Mountain is the highest peak in the Catskill Mountains of the U.S. state of New York. It is located in the town of Shandaken in Ulster County. While the 4,180-foot (1,270 m) contour line on topographic maps is generally accepted as its height, the exact elevation of the summit has never been officially determined by the U.S. National Geodetic Survey or its predecessors, and many informal surveys suggest the mountain may actually top 4,200 feet (1,280 m) above sea level. Geographically, it is the highest natural point within the New York Metropolitan Area.

While it was not identified as the range's highest peak until the late 19th century, it has played a prominent role in Catskill history. Renowned naturalist John Burroughs wrote memorably of his climbs up Slide, and it helped get the Catskills added to New York's Forest Preserve. Bicknell's thrush was first identified on its summit.

Like most other Catskill peaks, Slide's summit is gentle and rounded, taking the form of a narrow ridge that rises to a wider bump on its eastern end. From there the mountain slopes down steeply to the col with neighboring Cornell Mountain.

At the western end, a broad slope, part of the Catskill Divide, leads down to the gap between Slide and Hemlock Mountain to the west and Winnisook Lake, the source of Esopus Creek, to the mountain's northwest.

Two more pronounced ridges lead off the mountain, one to the southwest and the col with Wildcat Mountain, the other to the north and Giant Ledge.

Both upper branches of the Neversink River begin on the mountain's slopes.

In addition to the Catskills, Slide is also the highest point of:

It is also the southernmost peak in the Northeast exceeding 4,000 feet (1,200 m). The Appalachians do not rise to that level again until West Virginia.