The Harwell Science and Innovation Campus is a science and technology campus near the villages of Harwell and Chilton, Oxfordshire, England. The site is outside Didcot, about south of Oxford and roughly east of Wantage. A large part of the site was formerly the main research establishment of the United Kingdom Atomic Energy Authority, but it has seen a transition to its new role as a science and business park as the nuclear facilities have been decommissioned.