Duncan Archibald Graham, CC CBE FRSC (January 8, 1882 – February 18, 1974) was a Canadian physician and academic who held the first position in the British Empire of chair of clinical medicine, established by John Craig Eaton at the University of Toronto in 1919. He held this position and was chair of the department of medicine and physician-in-chief at the Toronto General Hospital, until 1947. He died in Toronto in 1974.