Date of Birth: 
About Donnacha O'Brien
- Donnacha O'Brien (born 22 July 1998) is a former Irish jockey who competed in Flat racing. O'Brien is the son of multiple champion trainer Aidan O'Brien and brother of jockey and trainer Joseph O'Brien.
- Donnacha O'Brien rode his first winner on Quartz, trained by his father, at Dundalk Stadium in September 2014, and gained his first Group 1 victory when he rode Intricately to win the 2016 Moyglare Stud Stakes.
- Intricately was bred by his mother, Anne Marie, and trained by his brother.
- O'Brien was Irish flat racing champion apprentice jockey in 2016 and Irish flat racing Champion Jockey for the first time in 2018.
- He retained his title in 2019, beating Colin Keane in a season which saw two jockeys ride over 100 winners in a season in Ireland for the first time.O'Brien announced his retirement from race riding on 25 November 2019 and announed his intention to take up training.
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