| The Merry Monarch | |
|---|---|
 The Merry Monarch with jockey Foster Bell. Painting by Francis Calcraft Turner. | |
| Sire | Slane |
| Grandsire | Royal Oak |
| Dam | The Margravine |
| Damsire | Little John |
| Sex | Stallion |
| Foaled | 1842 |
| Country | United Kingdom of Great Britain and Ireland |
| Colour | Bay |
| Breeder | G. W. Gratwicke |
| Owner | G. W. Gratwicke |
| Trainer | John Forth |
| Record | 4:1-1-0 |
| Major wins | |
| Epsom Derby (1845) | |
The Merry Monarch (1842 – after 1859) was a British Thoroughbred racehorse and sire. He ran four times in a career that lasted from July 1844 to May 1846 and won only one race. That race, however, was the 1845 Epsom Derby, in which he recorded an unexpected victory in a chaotic race. After one race in 1846 he was retired to stud where he made no impression as a sire.