| Black Ash Swamp | |
| Pushpin Map: | New York |
| Pushpin Map Caption: | Location of Black Ash Swamp within New York |
| Location: | Delaware County, New York |
| Coords: | 41.9012°N -75.2468°W |
| Inflow: | Blue Mill Stream |
| Outflow: | Blue Mill Stream |
| Area: | 25acres |
| Elevation: | [1] |
| Cities: | Lordville |
Black Ash Swamp is a small lake located northwest of Lordville in Delaware County, New York. Blue Mill Stream flows into the lake from the north, it drains south-southwest via Blue Mill Stream, which flows into the Delaware River. Somerset Lake is located northeast of Black Ash Swamp.