Parley Common is a Site of Special Scientific Interest (SSSI) on the edge of Ferndown in Dorset, England.

[1] Rare heathland species include the sand lizard (Lacerta agilis), smooth snake (Coronella austriaca), heath grasshopper (Chorthippus vagansand) and the Dartford warbler (Sylvia undata).

[1] Parley Common has an abundance of spider fauna—at least 147 species—which includes the very rare Ero aphana, Bassaniodes robustus (syn.

[2] The site is one of many areas in the South East Dorset in which grazing by cattle has been reintroduced, as part of efforts to control the growth of scrub.

[2][3] Arson and illegal vehicle use have caused damage to the site,[4] although community involvement is thought to have lessened the number of incidents.