Ernest Septimus Reynolds FRCP (7 April 1861 – 22 May 1926) was emeritus professor of clinical medicine at the University of Manchester. In 1900 he wrote "An Epidemic of Peripheral Neuritis Amongst Beer Drinkers in Manchester and District" for the British Medical Journal, the first of a series of papers which caused a national sensation when they revealed the presence of dangerous levels of arsenic in local beer.