| Official Name: | Blackhawk Island, Wisconsin |
| Pushpin Map: | Wisconsin#USA |
| Pushpin Label: | Blackhawk Island |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Jefferson |
| Subdivision Type3: | Towns |
| Subdivision Name3: | Koshkonong, Sumner |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 781 |
| Coordinates: | 42.8983°N -88.8922°W |
| Area Code: | 920 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1561899 |
Blackhawk Island is an unincorporated community located in the towns of Koshkonong and Sumner, Jefferson County, Wisconsin, United States. Its best known longtime resident was the poet, Lorine Niedecker.[1]