Allerthorpe Common
| Site of Special Scientific Interest | |
Western entrance to Allerthorpe Common
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 Shown within the East Riding of Yorkshire
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| Area of Search | Humberside |
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| Grid reference | SE761475 |
| Coordinates | 53°55′07″N 0°50′31″W / 53.918504°N 0.842049°WCoordinates: 53°55′07″N 0°50′31″W / 53.918504°N 0.842049°W |
| Interest | Biological |
| Area | 22.6 acres (0.091 km2; 0.0353 sq mi) |
| Notification | 1951 |
| Natural England website | |
Allerthorpe Common is a Site of Special Scientific Interest (SSSI) and nature reserve in the East Riding of Yorkshire, England. It is located close to the town of Pocklington. The site, which was designated a SSSI in 1951, lies on river and lake sands, which were deposited during the last glacial period 12-10,000 years ago. The soils are acidic and a variety of habitats, including wet and dry heath, mire, grassland and woodland have formed. The drier areas are dominated by heather interspersed with cross-leaved heath and purple moor grass. In the wetter areas purple moor grass forms dense tussocks. Common cottongrass and marsh cinquefoil occur in the wet mire conditions.
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