Commodore Alexander Grant (20 May 1734 – 8 May 1813) was a Scottish Royal Navy officer, businessman, and politician in British Canada.

Grant entered the Royal Navy in 1755 and saw service in British North America, on Lake Champlain, during the Seven Years' War.

Grant became a naval superintendent with the Provincial Marine in 1763, with his headquarters on Navy Island on in the Niagara River, before moving to Detroit, Quebec.

He built a commercial empire by also selling or renting ships to merchants and this was initially solidified during the American Revolution during which he was given military command of most of the Great Lakes.

However, in the course of the revolution Grant lost much of his income with the loss of 12,000 acres (49 km²) of land he owned in New York, and the end of his participation in private shipping.