| Location: | Longchamp Racecourse |
| Winning Horse: | Three Troikas |
| Previous: | 1978 |
| Next: | 1980 |
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. The winning time was 2:28.9.
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| Pos. | Marg. | Horse | Age | Jockey | Trainer (Country) | |
|---|---|---|---|---|---|---|
| 1 | Three Troikas | 3 | Freddy Head | Criquette Head (FR) | ||
| 2 | 3 | Le Marmot | 3 | Philippe Paquet | François Boutin (FR) | |
| 3 | 1 | Troy | 3 | Willie Carson | Dick Hern (GB) | |
| 4 | nk | Pevero | 4 | Alain Lequeux | François Boutin (FR) | |
| 5 | 4 | Trillion | 5 | Lester Piggott | Maurice Zilber (FR) | |
| 6 | ½ | Northern Baby | 3 | Pat Eddery | François Boutin (FR) | |
| 7 | 2 | Jeune Loup | 4 | Alain Badel | Olivier Douieb (FR) | |
| 8 | 8 | Noble Saint | 3 | Joe Mercer | Robert Armstrong (GB) | |
| 9 | 2 | Pawiment | 5 | Greville Starkey | Theo Grieper (GER) | |
| 10 | 5 | Crimson Beau | 4 | Geoff Baxter | Paul Cole (GB) | |
| 11 | nk | Pitasia | 3 | Alfred Gibert | Aage Paus (FR) | |
| 12 | 3 | Two of Diamonds | 3 | Steve Cauthen | Barry Hills (GB) | |
| 13 | nk | Valour | 4 | Paul Cook | Fulke Johnson Houghton (GB) | |
| 14 | 7 | Ile de Bourbon | 4 | John Reid | Fulke Johnson Houghton (GB) | |
| 15 | 5 | Fabulous Dancer | 3 | J Taillard | Criquette Head (FR) | |
| 16 | shd | Noble Dancer | 7 | Jacinto Vásquez | T. J. Kelly (USA) | |
| 17 | 6 | Top Ville | 3 | Yves Saint-Martin | François Mathet (FR) | |
| 18 | ¾ | Telescopico | 4 | Sandy Hawley | Maurice Zilber (FR) | |
| 19 | 15 | Kamaridaan | 3 | J Heloury | François Mathet (FR) | |
| 20 | Player | 3 | Edward Hide | |||
| 21 | Princess Redowa | 3 | M Ouzouir | Aage Paus (FR) | ||
| 22 | Rivadon | 3 | Alan Bond | Dick Hern (GB) |
Further details of the winner, Three Troikas.