| Vly Mountain | |
| Map: | New York#USA |
| Elevation Ft: | 3529 |
| Elevation Ref: | [1] |
| Prominence Ft: | 649 |
| Listing: | Catskill High Peaks 33rd |
| Location: | Halcott, Greene County, New York |
| Range: | Catskill Mountains |
| Coordinates: | 42.2458°N 100.9°W |
| Topo: | USGS West Kill |
Vly Mountain is a mountain located in the town of Halcott, New York, United States in Greene County. The mountain is part of the Catskill Mountains.Vly Mountain is flanked to the northwest by Bearpen Mountain, to the east by Vinegar Hill, to the northeast by Kipp Hill, and to the southeast by Beech Ridge.
The north side of Vly Mountain drains into Little West Kill, thence into Schoharie Creek, the Mohawk River, the Hudson River, and into New York Bay.The east side of Vly Mtn. drains through Roarback Brook into the West Kill, thence into Schoharie Creek.The south and west sides of Vly Mountain drain into Vly Creek, thence into Bush Kill, Dry Brook, the East Branch of the Delaware River, and into Delaware Bay.