Sir Peter John Morris (17 April 1934 – 29 October 2022) was an Australian surgeon and Nuffield professor of surgery at the University of Oxford.
He served as Director of the Centre for Evidence in Transplantation (CET) at the Royal College of Surgeons and the London School of Hygiene and Tropical Medicine, where he held an honorary professorship and was a member of Court.
He served as Chairman of the British Heart Foundation for 8 years and was President of the Medical Protection Society.
In the USA he was elected as a Foreign Member of both the Institute of Medicine of the National Academy of Sciences (1997) and the American Philosophical Society (2002).
One of his key contributions was the discovery of cytotoxic antibodies in patients after renal transplantation and their association with graft failure.