- Mother, Mary, is a sex therapist.
- Attended the 2001 Oscar party at the FilmHouse in Edinburgh, Scotland, where he was said to have cheered at every opportunity for his nominated film Chocolat (2000) by Lasse Hallström.
- Both he and his Summer of the Flying Saucer (2008) co-star Robert Sheehan have played a king of France. O'Conor played King Louis XIII of France in The Three Musketeers (1993) whereas Sheehan played his son King Louis XIV of France in Young Blades (2005).
- Received a scholarship to attend NYU Film School.
- Only became serious about acting after attending Trinity College in Dublin, Ireland.
- Breakthrough role was that of Graham Young in Benjamin Ross' The Young Poisoner's Handbook (1995).
- Father is a concert pianist.
- Father is Irish Pianist John O'Conor.
- Younger brother Keith, 23, is currently working towards a Masters in computer studies.
- Studied at Trinity College in Dublin Ireland.
- Appeared in the Oxford stage production of "The Wexford Trilogy"
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