The 1980 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 5 October 1980. It was the 59th running of the Prix de l'Arc de Triomphe.
The winner was Detroit, a three-year-old filly trained in France by Oliver Douieb. The winning jockey was Pat Eddery who was winning the race for the first time. The filly won by half a length and a short head from Argument and Ela-Mana-Mou.
The winning time of 2m 28.0s was a new record for the race.
<span style="font-size:85%">* Abbreviations: shd = short-head; nk = neck</span>
Further details of the winner, Detroit.