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Peter Robert Hadfield (born 21 January 1955) is an Australian Olympic athlete who competed in the decathlon.
Hadfield won a total of nine Australian Championships in Athletics between 1976 and 1985. He didn't compete in the National Championships in 1978 as he was living in Paris at the time, training there for the Edmonton Commonwealth Games. He was the best decathlete in Australia for ten years from his first nationals win in 1976, when he broke the Australian record, until he retired after the National Championships in 1985. Although he was the National Champion and record holder for the decathlon he was not selected to compete in the Montreal Olympics that year. He competed at the two following Olympic Games in Moscow (1980) and Los Angeles (1984) and two Commonwealth Games in Edmonton (1978) and Brisbane (1982), winning the silver medal, behind Daley Thompson in the 1978 Commonwealth Games in Edmonton.