Sir John Fraser, 1st Baronet, FRSEd (23 March 1885 – 1 December 1947) was Regius Professor of Clinical Surgery at Edinburgh University from 1925 to 1944 and served as principal of the University of Edinburgh from 1944 to 1947.
His study of tuberculosis in children was to disprove the view of the Nobel prize winner Robert Koch that bovine tuberculosis did not play a major pathogenic role in human disease.
The subsequent legislation led to the elimination of tuberculosis from milk supplies and resulted in a decline in incidence of bone and joint tuberculosis in children.
In 1940 he was the first surgeon in Britain to ligate an uninfected patent ductus arteriosus.