Broughton Down is a 45.8-hectare (113-acre) biological Site of Special Scientific Interest west of Broughton in Hampshire.

[1][2] The eastern half is a nature reserve managed by the Hampshire and Isle of Wight Wildlife Trust.

[3] This sloping site on chalk has grassland which is grazed by rabbits and has many anthills.

There are also areas of scrub and mature woodland.

Insects include silver-spotted skipper, Duke of Burgundy fritillary and Essex skipper butterflies and chalk carpet moths.