The 1979 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 7 October 1979.
It was the 58th running of the Prix de l'Arc de Triomphe.
The winner was Three Troikas, a three-year-old filly trained in France by Criquette Head and ridden by her brother Freddy.
The filly won by three lengths from Le Marmot with the odds-on favourite Troy in third.
* Abbreviations: ns = nose; shd = short-head; hd = head; snk = short neck; nk = neck Further details of the winner, Three Troikas.