| O'Connell Brook | |
| Pushpin Map: | New York |
| Pushpin Map Caption: | Location of the mouth of O' Connell Brook |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Subdivision Type4: | County |
| Subdivision Name4: | Otsego |
| Source1 Coordinates: | 42.7194°N -74.8703°W |
| Mouth: | Cherry Valley Creek |
| Mouth Coordinates: | 42.6909°N -74.8427°W[1] |
| Mouth Elevation: | 1234feet |
O'Connell Brook is a river in Otsego County, New York. It converges with Cherry Valley Creek northwest of Middlefield. On 1903 county maps it is referred to as Elm Brook.