- He was a guitarist for the band The Enemies, a five piece band from his native Ireland that he co-founded in 2002. He had to quit in 2012 due to his work as an actor.
- Father of his 2 children with wife Helen, a son Evan James O'Donoghue was born August 1, 2013, and a daughter Millie, born in May 2017.
- He was among the final contenders to play Superman in 'Man Of Steel (2013)'. The role eventually went to Henry Cavill.
- Appears in Christina Perri's "The Words" music video.
- At the age of 16 went to Paris for a month to learn to speak French.
- Supported the legalization of civil marriages between homosexuals in Ireland in name of Equality before the Law.
- His wife Helen is a schoolteacher.
- Vancouver, BC, Canada: Filming Once Upon A Time (November 2012)
- Attended The Gaiety School of Acting in Dublin.
- Parents are Con and Mary O'Donoghue.
- Has a brother, named Allen.
- In Once Upon a Time (2011), Colin O'Donoghue plays Killian Jones (aka Captain Hook), father of Alice, played by Rose Reynolds, despite her being only 10 years younger in real life.
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