|John James Rickard Macleod|
|Born||6 September 1876
|Died||16 March 1935
|Institutions||University of Toronto, Toronto, Canada|
|Alma mater||University of Aberdeen
University of Leipzig
|Notable awards||Nobel Prize in Physiology or Medicine (1923)|
John Macleod (John James Rickard Macleod, 6 September 1876 – 16 March 1935) was an Scottish physiologist. He won the 1923 Nobel Prize in Physiology or Medicine, with Frederick Banting, for the discovery of insulin.