Eaton Square is a residential garden square in London's Belgravia district. It is one of the three garden squares built by the Grosvenor family when they developed the main part of Belgravia in the 19th century, and is named after Eaton Hall, the Grosvenor country house in Cheshire. Eaton Square is larger but less grand than the central feature of the district, Belgrave Square, and both larger and grander than Chester Square. The first block was laid out by Thomas Cubitt from 1827.