Regent's Park Open Air Theatre is an open-air theatre in Regent's Park in central London.

Regent's Park is one of the Royal Parks of London. It occupies 410 acres (170 ha) of high ground in north-west Inner London, administratively split between the City of Westminster and the Borough of Camden. In addition to its large central parkland and ornamental lake, it contains various structures and organizations both public and private, generally on its periphery, including Regent's University and London Zoo.