Miles Stewart (born 4 May 1971 in Sydney, Manly) is an athlete from Australia, who competes in triathlon.

Originally a speedskater from Wollongong he rose to the elite ranks of the emerging sport of triathlon in the early 1990s whilst living on Queensland's Gold Coast.

Palmarès Stewart can be found in the Guinness Book of World Records for the fastest triathlon time in the world.

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