The 1991 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 6 October 1991.

[1] 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.

[2] Further details of the winner, Suave Dancer.