| Ryer Island | |
| Image Alt: | A grainy aerial photo of numerous small islands surrounded by water. |
| Pushpin Map: | United States Sacramento Delta#United States San Francisco Bay Area#USA California#USA |
| Coordinates: | 38.0828°N -122.0978°W |
| Location: | Northern California |
| Waterbody: | Suisun Bay |
| Area Sqft: | or |
| Area Acre: | --> |
| Length Ft: | --> |
| Width Ft: | --> |
| Coastline Ft: | --> |
| Country: | United States |
| Country Admin Divisions Title: | State |
| Country Admin Divisions Title 1: | County |
| Country Admin Divisions 1: | Solano |
Ryer Island is an island in Suisun Bay at the mouth of the Sacramento-San Joaquin River Delta in Solano County, California, eight miles east-northeast of Benicia. It is administered by Reclamation District 501, and is in the Suisun Resource Conservation District. At the time of statehood it was known as Kings Island, and is labeled as such on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold as well as an 1854 map of the area by Henry Lange. It is labeled, along with Deadman Island, Joice Island, Grizzly Island, Simmons Island, and Roe Island, on a 1902 USGS map of the area.