Cleaves Wood (grid reference ST758576) is a 40.38 hectare biological Site of Special Scientific Interest (SSSI) near the village of Wellow in Bath and North East Somerset, notified in 1988.

It has a high diversity of tree and shrub species and a large population of the nationally scarce plant spiked star-of-Bethlehem (Ornithogalum pyrenaicum).

[3] The habitat diversity of the site has resulted in a rich invertebrate fauna, including two nationally rare insects: the beetle Osphya bipunctata and the hoverfly Cheilosia nigripes.

Twenty-seven butterflies have been recorded from the site including the nationally scarce species, Duke of Burgundy (Hamearis lucina).

The nationally scarce moth, Blomer's rivulet (Discoloxia blomeri) has also been recorded on the site.