| Arnold Lake | |
| Pushpin Map: | New York |
| Pushpin Map Caption: | Location of Arnold Lake within New York State |
| Location: | Otsego County, New York |
| Coords: | 42.6114°N -75.0044°W |
| Outflow: | Spring Brook |
| Area: | 69acres |
| Elevation: | [1] |
| Cities: | Milford, New York |
Arnold Lake is a small lake located west-northwest of the Village of Milford in the Town of Hartwick in Otsego County, New York. The lake drains south via Spring Brook which flows into Goodyear Lake by Portlandville.