| Great Gully Brook | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Mouth: | Cayuga Lake |
| Mouth Location: | Farleys, New York, United States |
| Mouth Coordinates: | 42.8094°N -76.7139°W |
| Basin Size: | 15sqmi |
Great Gully Brook is a river located in Cayuga County, New York. It flows into Cayuga Lake by Farleys, New York.[1]