| Site of Special Scientific Interest | |
| Area of Search | East Sussex |
|---|---|
| Grid reference | TQ935180 |
| Coordinates | 50°55′44″N 0°45′18″E / 50.929°N 0.755°ECoordinates: 50°55′44″N 0°45′18″E / 50.929°N 0.755°E |
| Interest | Biological and Geologial |
| Area | 761.1 ha (1,881 acres) |
| Notification | 1953 |
| Natural England website | |
Rye Harbour Site of Special Scientific Interest is a nature reserve located on the western side of the mouth of the River Rother at Rye Harbour, about 1 mile downstream from Rye East Sussex. It forms part of a wide network of SSSI's on the Kent-Sussex border that include the Romney & Walland Marsh, the Dungeness Peninsular, the lower Rother Valley and the Pett Levels.
It is a complicated site of both biological and geological interest. Varied habitats of shingle, saltmarsh and intertidal muds host a wide variety of flora and fauna. It forms the second largest area of shingle habitat in southern England, only surpassed in area by Dungeness. A much larger area is designated as the Rye Harbour Local Nature Reserve.