Crab Wood is a 73-hectare (180-acre) biological Site of Special Scientific Interest west of Winchester in Hampshire.

[1][2] An area of 37.8 hectares (93 acres) is also a Local Nature Reserve.

[3][4] This site has been wooded at least since the sixteenth century.

It has a hazel layer which has been coppiced, large oaks and some beech, ash and birch trees.

There is a rich butterfly fauna, including purple emperors.