| St Leonard's Forest SSSI | |
| Aos: | West Sussex |
| Interest: | Biological |
| Area: | 85.4ha |
| Notifydate: | 1987 |
| Map: | Magic Map |
St Leonard's Forest SSSI is an 85.4abbr=offNaNabbr=off biological Site of Special Scientific Interest east of Horsham in West Sussex.[1] [2] The SSSI is in two separate areas, with the western part being in the 289abbr=offNaNabbr=off Forestry Commission managed St Leonard's Forest.[3]
Much of the forest is deciduous woodland, which is dominated by pedunculate oak, silver birch, common birch and beech. The humid microclimate of a narrow valley has allowed mosses and liverworts to survive which indicate continuous woodland cover for the past 5,000 years. Butterflies include the rare purple emperor.[4]
There is public access to the western part of the site.