Thomas Dunn (1729 – 15 April 1818) was the Lieutenant-Governor of Lower Canada from 1805 to 1807.
He was born in Durham, England, and came to the town of Quebec shortly after its surrender in 1760.
With his partner, John Gray, he obtained the trading lease to the king's posts, which gave them a monopoly in the fur trade and fishing on the north coast of the Saint Lawrence River.
Dunn was also the owner of the Cape Diamond Brewery at Quebec City.
Three sons were born of their union: Thomas and William, who would both pursue military careers, and Robert.