George Neil Stewart (18 April 1860 – 28 May 1930) was a Scottish-Canadian medical doctor who made a major contribution to teaching and research in physiology.

in 1891, winning the gold medal for his graduation thesis, The influence of temperature and of endocardiac pressure on the heart, and particularly on the action of the vagus and cardiac sympathetic nerves.

[3] Additionally, in 1892 he submitted an essay for the Goodsir Memorial Prize, Researches on the circulation time in organs and on the influences which affect it.

[4] Following his D.Sc, Stewart became senior demonstrator of physiology at Owens College, Victoria University, Manchester (1887–1889), where he learned from William Stirling the value of the illustrative experiment in teaching science.

Stewart published a series of papers on "The liberation of epinephrin from the adrenals" in the Journal of Pharmacology and Experimental Therapeutics.

In later life he suffered from pernicious anemia and progressive spinal degeneration, but he remained mentally alert until the end and made notes about his own condition.

Stewart married Louise Kate Powell on 20 September 1906, and his wife and four children were living in Toronto at the time of his death.