Margaret Kennedy was an English novelist and playwright.
She attended Cheltenham Ladies' College, where she began writing, and then went up to Somerville College, Oxford in 1915 to read history. Her first publication was a history book, A Century of Revolution (1922). Margaret Kennedy was married to the barrister David Davies. They had a son and two daughters, one of whom was the novelist Julia Birley. The novelist Serena Mackesy is her grand-daughter.