| Horse Brook | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Subdivision Type3: | County |
| Subdivision Name3: | Delaware |
| Source1: | Lake Mimi |
| Source1 Location: | NNW of Roscoe, New York |
| Source1 Coordinates: | 41.9886°N -74.9267°W |
| Source1 Elevation: | NaNid = 957371 |
| Mouth: | Beaver Kill |
| Mouth Location: | NW of Roscoe, New York |
| Mouth Coordinates: | 41.9564°N -74.9344°W[1] |
| Mouth Elevation: | 1217feet |
| Basin Size: | 2.64sqmi |
Horse Brook is a river in Delaware County, New York. It drains Lake Mimi and flows south before converging with Beaver Kill northwest of Roscoe.[2]