William Brack (born 26 December 1935) is a Canadian former racing driver. Brack raced in Formula One and the Atlantic Championship.

Born in Toronto, Ontario, Canada, Brack originally became involved in auto racing in the early 1960s, in the form of ice-racing Minis (using a company car) in Huntsville, Ontario. He went on to purchase Gordon Brown's own racing Mini (Gord Brown being another Mini racer as well as dealer of British cars at Glendale Suburban Motors in Brampton.)

Brack subsequently became a Formula One driver who raced for the Lotus and BRM teams. After Formula One he was successful in Atlantic Championship in the mid-1970s, having won the Canadian Formula Atlantic Championships in three successive years (1973, 1974, 1975) before retiring from racing to open a Daimler Chrysler dealership (Downtown Chrysler) near the Canadian National Exhibition in Toronto. He is not related to the Swedish race car driver Kenny Bräck.

Complete Formula One results

(key)

Year Entrant Chassis Engine 1 2 3 4 5 6 7 8 9 10 11 12 WDC Points 1968 Gold Leaf Team Lotus Lotus 49B Cosworth V8 RSA ESP MON BEL NED FRA GBR GER ITA CAN
Ret USA MEX NC 0 1969 Owen Racing Organisation BRM P138 BRM V12 RSA ESP MON NED FRA GBR GER ITA CAN
NC USA MEX NC 0 1972 Marlboro BRM BRM P180 BRM V12 ARG RSA ESP MON BEL FRA GBR GER AUT ITA CAN
Ret USA NC 0