Isabelle Marques Vieira (born November 13, 1971) is a former Olympic freestyle swimmer from Brazil, who participated in a Summer Olympics for her native country.
At the 1988 Summer Olympics in Seoul, she finished 11th in the 4×100-metre freestyle, and 37th in the 100-metre freestyle.
She was at the 1991 Pan American Games in Havana, where she earned a bronze medal in the 4×100-metre freestyle.
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