Hurst Hill or Cumnor Hurst is a 20.6-hectare (51-acre) biological and geological Site of Special Scientific Interest west of Oxford in Oxfordshire.

[3] The site is owned by All Souls College, Oxford,[4] and its mosses and liverworts have been monitored for more than fifty years.

In 1879 a fossil of a Camptosaurus prestwichii, a large herbivorous dinosaur dating to the Upper Jurassic 153 million years ago, was found on the site.

[5] The fossil belongs to a typically North African genus, and provides evidence of a land bridge across the proto-Atlantic in the Late Jurassic.

[6] The hill is mentioned in Matthew Arnold's poem The Scholar Gipsy.