- 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 Le 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 Les trois mousquetaires (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' Le manuel d'un jeune empoisonneur (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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