St George Hanover Square was a civil parish created in 1724 in the Liberty of Westminster, Middlesex, which was later part of the metropolitan area of London, England. The creation of the parish accompanied the building of St George's, Hanover Square, constructed by the Commission for Building Fifty New Churches to meet the demands of a growing population. The parish was formed from part of the quite early medieval (in legal parlance called ancient) parish of Saint Martin in the Fields in the consequent Liberty of Westminster, probably one parish at the time of the Norman conquest, and in the hundred of Ossulstone. It included some of the most fashionable areas of what later became the West End of London, including Belgravia and Mayfair. Civil parish administration, known as a select vestr