| McMurdy Brook | |
| Pushpin Map: | New York |
| Pushpin Map Caption: | Location of the mouth of McMurdy Brook |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Subdivision Type4: | County |
| Subdivision Name4: | Delaware |
| Source1 Coordinates: | 42.3951°N -74.7168°W |
| Mouth: | West Branch Delaware River |
| Mouth Coordinates: | 42.3659°N -74.6913°W[1] |
| Mouth Elevation: | 1581feet |
McMurdy Brook is a river in Delaware County, New York. It flows into the West Branch Delaware River west-southwest of Hobart.