Gallows Hill SSSI is a Site of Special Scientific Interest on the north side of the Ebble Valley in south Wiltshire, England.

The site includes three areas of a series of slopes, with a range of aspects, on a long ridge of Lower, Middle, and Upper Chalk formations.

[1] The site lies in Alvediston parish and within the Cranborne Chase and West Wiltshire Downs Area of Outstanding Natural Beauty.

[1] The site is notable for (in the grassland areas) Festuca ovina (sheep's fescue), Avenula pratensis (meadow oat-grass), Brachypodium pinnatum (tor-grass), and Polyommatus bellargus (Adonis Blue) – a nationally scarce species of butterfly.

In the scrub areas are Crataegus monogyna (common hawthorn), and Hedera helix (ivy).