Frank Stack (January 1, 1906 – January 5, 1987) was a Canadian speed skater and Olympic medalist. He was born in Winnipeg, Manitoba.
At the 1932 Winter Olympics held in Lake Placid, New York, he qualified to the finals in all distances and finished third in the 10000 metres event, fourth in both the 500 metres competition and the 1500 metres event and seventh in the 5000 metres competition.
Sixteen years later he finished sixth in the 500 metres event and 27th in the 1500 metres competition at the 1948 Games.
He was inducted into the Manitoba Sports Hall of Fame and Museum in 1981.