| Site of Special Scientific Interest | |
 | |
| Location | Greater London Essex |
|---|---|
| Grid reference | TQ531800 |
| Interest | Biological |
| Area | 479.3 hectares |
| Notification | 1986 |
| Location map | Magic Map |
Rainham Marshes is an RSPB nature reserve in the east of London, adjacent to the Thames Estuary in Purfleet, Thurrock and the London Borough of Havering.