Westbury Brook Ironstone Mine (grid reference SO662166) is a 15.69-hectare (38.8-acre) biological Site of Special Scientific Interest in Gloucestershire, notified in 1998.

[1][2] The mine is one of a series of Sites of Special Scientific Interest within the Forest of Dean and Wye Valley (Gloucestershire and Monmouthshire).

These sites support (between them) breeding and hibernation roosts for Lesser and Greater horseshoe bats.

A ring of iron-ore bearing Carboniferous Limestone in the Forest of Dean has created a series of ancient and more recent mines which provide hibernation sites.

Westbury Brook Ironestone Mine is a recorded hibernation site for both Lesser and Greater Horseshoe bats.