| Thistle Island | |
| Map: | New York |
| Location: | Fourth Lake |
| Coordinates: | 43.7539°N -74.8697°W[1] |
| Elevation Ft: | 1713 |
| Country Admin Divisions Title: | State |
| Country Admin Divisions Title 1: | County |
| Country Admin Divisions 1: | Herkimer |
| Country Admin Divisions Title 2: | Town |
| Country Admin Divisions 2: | Webb |
Thistle Island is an island on Fourth Lake in Herkimer County, New York. It is located east-northeast of Old Forge.