Sir Herbert Samuel Holt (February 12, 1856 – September 29, 1941) was an Irish-born Canadian civil engineer who became a businessman, banker, and corporate director with a ruthless business reputation. He was President of the Royal Bank of Canada, Montreal Light, Heat & Power, and a director of some 250 companies worldwide, with assets valued at around $200 million. On his death, the Montreal Gazette described him as "the richest man in Canada", but he was also one of the most reviled. Among his peers in the Golden Square Mile, "everyone respected his business ability, but nobody liked him personally". Holt was one of the founders of the Town of Hampstead, Quebec