St Mary's, Bryanston Square, is a Church of England church dedicated to the Virgin Mary on Wyndham Place, Bryanston Square, London. A related Church of England primary school which was founded next to it bears the same name.

Marguerite Gardiner, Countess of Blessington, was an Irish novelist, journalist, and literary hostess. She became acquainted with Lord Byron in Genoa and wrote a book about her conversations with him.