John George McTavish (c. 1778 – 20 July 1847, also spelled Mactavish) was a Scottish-born fur trader who played a significant role in the North West Company's activities in North America during the early 19th century. He entered the North American fur trade in 1798 with the North West Company, wherein he challenged the monopoly of the Hudson's Bay Company. Personal controversies arose from his marriages, notably abandoning his common-law wife Matooskie, an Indigenous Canadian woman, for Catherine Aitken Turner, sparking condemnation and rumours.
In the 1830s, his health declined. He died in 1847, leaving his estate to daughters from both marriages.