William David "Bill" Baillie (born 28 May 1934 in Nelson, New Zealand) was a runner, who represented New Zealand at the 1964 Summer Olympics in Tokyo, where he placed 6th in the 5000 m. He also competed at the 1954, 1958, 1962, and 1966 British Empire and Commonwealth Games. He is the current national record holder over 20000 m and 1 hour.