Isle of the Onondagas also known as Big Island is an island on the Mohawk River south of Scotia in Schenectady County, New York.
  Isle of the Onondagas | |
| Geography | |
|---|---|
| Location | Mohawk River |
| Coordinates | 42°49′00″N 73°58′00″W / 42.81667°N 73.96667°W[1] |
| Highest elevation | 220 ft (67 m) |
| Administration | |
 United States | |
| State |  New York |
| County | Schenectady |
| Towns | Glenville |