| Mill Brook | |
| Pushpin Map: | New York |
| Pushpin Map Caption: | Location of the mouth of Mill Brook |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Mouth: | Unadilla River |
| Mouth Coordinates: | 42.6259°N -75.3277°W |
Mill Brook is a river in Chenango County, New York. It flows into Unadilla River north of New Berlin.