| Flax Island Creek | |
| Pushpin Map: | USA New York |
| Pushpin Map Caption: | Location of the mouth in New York |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Subdivision Type3: | Region |
| Subdivision Name3: | Central New York Region |
| Source1 Coordinates: | 42.4664°N -75.2325°W |
| Mouth: | Susquehanna River |
| Mouth Location: | Otego, New York |
| Mouth Coordinates: | 42.3872°N -75.1806°W[1] |
| Mouth Elevation: | 1020feet |
Flax Island Creek is a river located in southern Otsego County, New York. The creek converges with the Susquehanna River by Otego, New York.
Flax Island Creek is named after a small island, called Flax Island, that used to be on the Susquehanna River below the mouth where the wild flax grew in abundance. In the resurvey of the Wallace patent in 1773 the island is shown as Flax Island.[2]