The 1998 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 4 October 1998. It was the 77th running of the Prix de l'Arc de Triomphe.
The winner was Sagamix, a three-year-old colt trained in France by André Fabre. The winning jockey was Olivier Peslier.
Further details of the winner, Sagamix.