Thistle Island is an island on Fourth Lake in Herkimer County, New York. It is located east-northeast of Old Forge.
  Thistle Island | |
| Geography | |
|---|---|
| Location | Fourth Lake |
| Coordinates | 43°45′14″N 74°52′11″W / 43.75389°N 74.86972°W[1] |
| Highest elevation | 1,713 ft (522.1 m) |
| Administration | |
 United States | |
| State |  New York |
| County | Herkimer |
| Town | Webb |