New Zealand's first gold medal in Olympic athletics (track and field) was won by Jack Lovelock in the 1936 Olympic Games in Berlin. He won the 1500 meter race in what was then a world record time of 3:47.8.
gold, first place
Milkha Singh
track ands field running
Track and Field, Men's Triple Jump in 1896.
Jim Thorpe
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Al Oerter (Discus)
No one has won a track and field medal for Canada since 1996 when Donovan Bailey won the 100m.
Gold
Yvette Williams in long jump at the 1952 Games in Helsinki
Jack Lovelock in men's 1500 meter run.
Cathy Freeman was Australia's first aboriginal track and field athlete and in 1992 she became the first Australian Aborigine to compete in the Olympic Games and in 1990 became the first to win a medal in an international track meet (bronze in the 4x400 meter relay at the Auckland Commonwealth Games in 1990).