The Normansfield Theatre is a Victorian era building located in Teddington, England. The theatre is on the site of Normansfield Hospital, which was a self-sufficient Victorian hospital complex run by Dr John Langdon Down. The hospital was where Doctor Langdon Down conducted the pioneering research into the syndrome now known as Down's Syndrome. The theatre was constructed in 1877 and completed in 1879 for the use of the patients. The theatre is held in care by the Langdon Down Centre Trust.