Mary Rothes Margaret Cecil, 2nd Baroness Amherst of Hackney, OBE (née Mary Rothes Margaret Tyssen-Amherst; 25 April 1857 – 21 December 1919) was a British hereditary peer, charity worker, amateur archaeologist, and ornithologist. She was one of the few English women to have held a peerage in her own right and made significant contributions to archaeology and ornithology.