Keith's Chapel also known as Mr Keith's Chapel and the May Fair Chapel, was a private chapel in Curzon Street, Mayfair, London, operated by the 18th century Church of England clergyman Alexander Keith. The marriages at Keith's Chapel were perfectly lawful, as until 1754 the only indispensable element of a marriage in England was a Church of England clergyman. At its height, some six thousand marriages a year were taking place at the chapel. When his wife died in January 1750, Keith combined the announcement of her death in the Daily Advertiser with an advertisement for his chapel's services.