Isabelle Mouthon-Michellys (born 14 June 1966 in Annecy) is an athlete from France, who competes in triathlon.
She took seventh place with a total time of 2:02:53.41.
Her split times were 19:48.98 for the swim, 1:05:28.50 for the cycling, and 0:37:35.93 for the run.
Her twin sister, Béatrice Mouthon, also competed in the 2000 Olympic triathlon.
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