Sir William George Dismore Upjohn, OBE (16 March 1888 – 18 January 1979) was a noted Australian surgeon.
From Narrabri in New South Wales, he received his medical education at the University of Melbourne and served at Royal Melbourne Hospital before entering private practice.
A lieutenant-colonel within the Australian Army Medical Corps during World War I, he served in the Gallipoli campaign, investigating a dysentery epidemic, before being transferred to France in 1916.
He was twice mentioned in dispatches.After his discharge he joined the Royal College of Surgeons and resumed duties as a surgeon and general practitioner in Melbourne.
He helped found the Royal Australasian College of Surgeons, and was a member of medical committees during World War II working to coordinate medical matters for the armed forces.
He was also Chancellor of the University of Melbourne between 1966 and 1967.