| Lake Brook | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Subdivision Type3: | County |
| Subdivision Name3: | Delaware |
| Source1: | Odell Lake |
| Source1 Location: | NNW of Hobart |
| Source1 Coordinates: | 42.4215°N -74.6932°W |
| Source1 Elevation: | NaNid = 959223 |
| Mouth: | West Branch Delaware River |
| Mouth Location: | W of Hobart |
| Mouth Coordinates: | 42.3717°N -74.6872°W[1] |
| Mouth Elevation: | 1585feet |
| Basin Size: | 6.9sqmi |
Lake Brook is a river in Delaware County, New York. It drains Odell Lake and flows south before converging with the West Branch Delaware River west of Hobart.[2]