
O'Brien grew up in nearby Royton and was educated at the Bishop Henshaw Roman Catholic Memorial High School in Rochdale. He began acting at an early age and was the star of a BBC TV series Gruey by the time he was 15. He also featured in several other series at the time in one-off or recurring roles. In 1993, he played the role of Craig Lee in Coronation Street and then the role of Lee Jones in Children's Ward. In 1993 he also became a regular in the detective series, Cracker, playing Mark, the son of central character Robbie Coltrane. In 1999 he made his cinema debut with the film Virtual Sexuality and began a reunited with Cracker director Michael Winterbottom for 24 Hour Party People in 2002 and, in '04, for the controversial 9 Songs, which included scenes of genuine sexual intercourse between O'Brien and his leading lady Margo Stilley. His role had earned him the credit of being the only mainstream British actor who has been shown ejaculating in a mainstream UK-produced feature. Since 9 Songs, O'Brien has made two further films with Winterbottom; A Cock and Bull Story and The Look of Love. Recent regular TV roles include Holby Blue and The Syndicate.
A Thousand Blows
2025
The Family Pile
2023
Andor
2022
Ted Lasso
2020
Years and Years
2019
Chernobyl
2019
Holmes & Watson
2018
Peterloo
2018
Trucking Hell
2018
The Watchman
2016
No Offence
2015
Grantchester
2014
Glue
2014
Prey
2014
The Look of Love
2013
Bluestone 42
2013
Spike Island
2012
Cuckoo
2012
Love Life
2012
Vera
2011
Silk
2011
Moving On
2009
The Last Enemy
2008
Indie Sex
2007
Holby Blue
2007
Life on Mars
2006
Goal!
2005
Bloodlines
2005
The Banker
2004
9 Songs
2004
New Tricks
2004
Blue Murder
2003
Burn It
2003
Band of Brothers
2001
Messiah
2001
Born to Run
1997
Cracker
1993
Heartbeat
1992
Children's Ward
1989
Monster Maker
1989
Bellman and True
1987
Casualty
1986
Dramarama
1983



























































