Mary Adelaide Eden Ross (née Phillpotts; 23 April 1896 – 4 June 1993) was an English novelist, poet and playwright.

Her father, the successful and prolific writer Eden Phillpotts, was impressed enough by Agatha's early work to help her with it, but at that point unsuccessfully.

James Y. Dayananda notes that she published seven similar books where the lead character is not an ambitious feminist but is instead a woman based in the home.

The books, A Marriage, The Gallant Heart, The Round of Life, Our Little Town, From Jane to John, The Fosterling, Stubborn Earth were published between 1928 and 1951.

[1] The National Portrait Gallery holds two photographs of Phillpotts, both taken in 1926 and donated by Pinewood Studios via the Victoria and Albert Museum in 1989.