Bloomsbury Square is a garden square in Bloomsbury, in the London Borough of Camden, London. Developed in the late 17th century, it was initially known as Southampton Square and was one of the earliest London squares. By the early 19th century, Bedford House along the north of the square had been demolished and replaced with terraced housing designed by James Burton.

A garden square is a type of communal garden in an urban area wholly or substantially surrounded by buildings; commonly, it continues to be applied to public and private parks formed after such a garden becomes accessible to the public at large. The archetypal garden square is surrounded by tall terraced houses and other types of townhouse. Because it is designed for the amenity of surrounding residents, it is subtly distinguished from a town square designed to be a public gathering place: due to its inherent private history, it may have a pattern of dedicated footpaths and tends to have considerably more plants than hard surfaces or large monuments.