| Derby | |
| Location | Epsom Downs Racecourse |
|---|---|
| Date | 6 June 1984 |
| Winning horse | Secreto |
| Starting price | 14/1 |
| Jockey | Christy Roche |
| Trainer | David O'Brien |
| Owner | Luigi Miglietti |
| Conditions | Good |
| 1-2-3 | ||
|
|
|
| Secreto | El Gran Senor | Mighty Flutter |
| Also Ran | ||
|---|---|---|
| 4-5-6 | ||
|
|
|
| At Talaq | Alphabatim | Telios |
| 7-8-9 | ||
|
|
|
| Long Pond | Kaytu | Sheer Heights |
| 10-11-12 | ||
|
|
|
| Ilium | Pigwidgeon | Elegant Air |
| 13-14-15 | ||
|
|
|
| Claude Monet | My Volga Boatman | Sassanoco |
| 16-17 | ||
|
|
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|
| Cataldi | Northern Fred | 17 Ran |
The 1984 Epsom Derby was the 205th annual running of the Derby horse race. It took place at Epsom Downs Racecourse on 6 June 1984. It was the first edition of the race to be commercially sponsored and was known as the Ever Ready Derby. The sponsorship meant that the first prize of £227,680 was the biggest in the history of the race.
The race was won by Luigi Miglietti's Secreto at odds of 14/1, ridden by Christy Roche and trained in Ireland by David O'Brien. The favourite El Gran Senor, trained by David O'Brien's father Vincent finished second by a short head. The colt's win was a first success in the race for owner, trainer and jockey. At the age of 27, David O'Brien was one of the youngest men to have trained a Derby winner.