Chalcot Square is a garden square in the Primrose Hill district of London, England.
The square was laid out between 1849 and 1860 and was known as St George's Square until 1937. It is a residential square, well known for its brightly coloured Italianate terraced houses. Every house on the square is grade-II listed.
Sylvia Plath and Ted Hughes lived at 3 Chalcot Square for years and Plath is commemorated with a blue plaque. They rented their home to Assia Wevill and David Wevill. Other famous residents have included Ralph, Marion, Ed, and David Miliband; Robert Plant; Joan Bakewell; India Knight and Eric Joyce; Alan Bennett, and M. R. D. Foot.