The 1991 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 6 October 1991. It was the 70th running of the Prix de l'Arc de Triomphe.
The winner was Suave Dancer, a three-year-old colt trained in France by John Hammond. The winning jockey was Cash Asmussen.
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Further details of the winner, Suave Dancer.