1978 Prix de l'Arc de Triomphe
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| Prix de l'Arc de Triomphe | |
| Location | Longchamp, Paris, France |
|---|---|
| Date | 1 October 1978 |
| Distance | 2,400 metres (1.5 mi) |
| Winning horse | Alleged (IRE) |
| Winning time | 2:36.1 |
| Final odds | 14/10 favourite |
| Jockey | Lester Piggott |
| Trainer | Vincent O'Brien |
| Owner | Robert Sangster |
The 1978 Prix de l'Arc de Triomphe was a horse race held at Longchamp on Sunday 1 October 1978. It was the 57th running of the Prix de l'Arc de Triomphe.
The winner was Alleged, a four-year-old colt trained in Ireland by Vincent O'Brien and ridden by Lester Piggott. Alleged, the 14/10 favourite, defeated the mare Trillion by two lengths, with Dancing Maid a further two lengths back in third. Alleged became the sixth horse to win the race twice after Ksar, Motrico, Corrida, Tantieme and Ribot. The winning time was 2:36.1.
- Sponsor: none
- Purse:
- Going: Dead
- Distance: 2,400 metres
- Number of runners: 18
- Winner's time: 2:36.1