| Deer Island | |
| Image Alt: | A photograph of an island. |
| Pushpin Map: | United States San Francisco Bay Area#USA California#USA |
| Coordinates: | 38.0978°N -122.5369°W |
| Location: | Northern California |
| Waterbody: | Novato Creek |
| Area Sqft: | or |
| Area Acre: | --> |
| Length Ft: | --> |
| Width Ft: | --> |
| Coastline Ft: | --> |
| Elevation Ft: | 167 |
| Country: | United States |
| Country Admin Divisions Title: | State |
| Country Admin Divisions Title 1: | County |
| Country Admin Divisions 1: | Marin |
Deer Island is a former island in Marin County, California, close to (and formerly surrounded by wetlands of) the Novato Creek, upstream of San Pablo Bay (an embayment of San Francisco Bay). It is now the location of Deer Island Preserve. It used to be inhabited by Antonio DeBorba, who hiked the nearby wetlands to avoid having to use a boat to get home. The building is still there on the Northeastern part of the island.[1] Deer Island's coordinates are 38.0978°N -122.5369°W, and its elevation is .