Karl Brooks Heisey (1895, Markham, Ontario – 7 December 1937, Toronto, Ontario) was a well-known Canadian mining engineer and mining executive in the 1930s. Heisey pioneered the exploration and development of the Sanshaw/Red Lake metal deposits located in northwest Ontario. The Red Lake Mine is one of the richest gold mines in the world, still in production today with annual production of 600,000 ounces gold and over 11 million ounces produced to date.