Sir Maurice Alan Cassidy GCVO CB (29 February 1880 – 22 October 1949) was a British doctor, physician to the King from 1937 until his own death. Maurice was born the eldest son of David McKay Cassidy, a doctor at the Lancaster Mental Hospital in Lancashire and was educated at Lancaster Royal Grammar School and Clare College, Cambridge. He then entered St Thomas' Hospital in London as a medical student, qualifying M.B. in 1906 and M.D. in 1909. He died at his home in London in 1949 following a car accident. He had married Elsie, daughter of Frederick Relfe but left no children.