William Dow (March 27, 1800 – December 7, 1868) was a British-born brewer and financier of Montreal, Quebec, Canada.

Born at Muthill, Perthshire, he was the eldest son of Dr William Dow (1765-1844), Brewmaster, and Anne Mason.

Having gained an extensive experience in brewing under his father, he emigrated from the UK to Montreal, Lower Canada in about 1818.

He was employed as foreman of Thomas Dunn's brewery in Montreal and quickly became a partner.

Dow was also a financier and in 1860 he built his home, Strathearn House, in Montreal's Golden Square Mile.