| Bagley Brook | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Source1 Location: | Delaware County, New York |
| Mouth: | West Branch Delaware River |
| Mouth Location: | De Lancey, New York, Delaware County, New York, United States |
| Mouth Coordinates: | 42.2106°N -74.9728°W |
| Basin Size: | 15.6sqmi |
Bagley Brook flows into the West Branch Delaware River by De Lancey, New York.[1]