Heathfield Park SSSI is a biological Site of Special Scientific Interest east of Heathfield in East Sussex. It is part of Heathfield Park, a Grade II* listed building and park.
This is a steep valley carved by a stream. The sheltered wooded habitat has a warm and moist microclimate and it has a number of plant species usually restricted to western Britain, such as Cornish moneywort, hay-scented buckler-fern and the liverwort "Frullania tamarisci". The site is also important for lichens and 76 species have been recorded.
The site is private land with no public access.
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