Cornwall Terrace is a Grade I listed building of consecutive terraced mansions overlooking Regent's Park in the City of Westminster, London. It is situated at the park's southwest corner, near Baker Street, between York Terrace and Clarence Terrace, within the park's Crown Estate development. Cornwall Terrace was part of the scheme of the Prince Regent, later King George IV, to develop grand housing in Regent's Park. The buildings are Grade I listed buildings.

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.