Thomas Wallace Dunn (December 4, 1911 – April 21, 2004) was a Canadian-born Thoroughbred horse trainer.
Born in Minitonas, Manitoba, Wally Dunn went to Vancouver, British Columbia, at age seventeen, where he would find work in Thoroughbred horse racing.
In the 1930s, Wally Dunn took horses south to race at Santa Anita Park in Los Angeles, California.
Dunn's career as a trainer was interrupted by World War II when he served overseas with the Canadian Army.
In 1964, he trained Colorado King who also won the Hollywood Gold Cup Stakes and equalled the world record time of 1:46.40 for 1 1/8 miles in winning the American Handicap.