| Middle Ground Island | |
| Image Alt: | Aerial image of an island. |
| Pushpin Map: | United States Sacramento Delta#USA California#USA |
| Coordinates: | 38.0628°N -121.9814°W |
| Location: | Northern California |
| Waterbody: | Sacramento–San Joaquin River Delta |
| Area Sqft: | or |
| Area Acre: | --> |
| Length Ft: | --> |
| Width Ft: | --> |
| Coastline Ft: | --> |
| Elevation Ft: | 0 |
| Country: | United States |
| Country Admin Divisions Title: | State |
| Country Admin Divisions Title 1: | County |
| Country Admin Divisions 1: | Solano |
Middle Ground Island is an island in Suisun Bay, an embayment of San Francisco Bay, downstream of the Sacramento–San Joaquin River Delta. It is part of Solano County, California, and not managed by any reclamation district. Its coordinates are 38.0628°N -121.9814°W, and the United States Geological Survey measured its elevation as in 1981.