Sir William Melville Arnott MC TD FRCPE FRCP FRSE FRCPath (14 January 1909 – 17 September 1999) was a Scottish academic. Born in Edinburgh, the son of a Scottish minister, he graduated from the University of Edinburgh in 1931 and was awarded his MD on renal hypertension in 1937. He served in the Royal Army Medical Corps during the Second World War and after serving in Singapore and Tobruk, was one of the first medical officers to enter Bergen-Belsen concentration camp at the end of the war in Europe. He was awarded the Military Cross in the king's 1940 Birthday Honours.