Michael George Corbett Ashby, M.R.C.P., F.R.C.P. (1 November 1914 – 10 December 2004) was a consultant neurologist at the Whittington Hospital, London and an expert witness for the prosecution in the failed trial of suspected serial killer John Bodkin Adams.
Ashby (always known as "Mike") was born in London, the son of Arthur Brian Ashby, a barrister and company chairman, and Dame Margery Corbett-Ashby. He was educated at Ashdown House Preparatory School and at Oundle School. He studied medicine at New College, Oxford, and at the London Hospital. Whilst at Oxford he rowed in the boat that won the Boat Race in 1936 and 1937. At London Hospital he was United Hospitals light-heavyweight boxing champion for two successive years.
After qualifying, he was a house physician before joining the RAMC, where he served from 1943 until 1947, becoming a medical specialist in 1945.
On discharge from the Army in 1947 he worked at the National Hospital before returning to London Hospital as senior registrar to Russell Brain and Ronald Henson. In 1949 he was appointed consultant neurologist to the Whittington Hospital in north London, where he remained until his retirement in 1975. He succeeded Macdonald Critchley as consultant neurologist to the Royal Masonic Hospital in 1965, also retiring from there in 1975.