| Flat Hill | |
| Location: | Sundown, New York, U.S. |
| Coordinates: | 41.8769°N -74.3578°W |
| Coordinates Ref: | [1] |
| Topo: | USGS West Shokan |
| Map: | New York#USA |
Flat Hill is a mountain located in the Catskill Mountains of New York east-southeast of Sundown. Steiny Hill is located east and Pople Hill is located northwest of Flat Hill.