|Origin||Derry, Northern Ireland|
During her teens she got involved, through school, in drama and music activities, and joined a local amateur dramatics group, the Oakgrove Theatre Company. At one time she was a backing singer in a local band, The Listener. Her big break came when she starred as Bernie in The Commitments.
Gallagher has appeared in such films as Thunderpants, You, Me & Marley, Divorcing Jack, Pulp Fiction, Star Wars Episode I: The Phantom Menace, Tristan & Isolde, Last Chance Harvey, Sherlock Holmes and Grabbers, and on stage in a Théâtre de Complicité production of The Street of Crocodiles and The National Theatre's production War Horse as Rose Narracott.
Gallagher's first album Precious Soul was released in 2004 on the Salty Dog Records label and was produced by John Reynolds. The album features collaborations with Brian Eno on the songs "He Don't Love You" and "Hooks". Gallagher wrote most of the music on the album, played the drums and sang lead vocals.
Gallagher starred as the mother of young Nick in the BBC drama "Nick Nickleby". She also played Trisha Meehan in The Field of Blood.
An image of Gallagher, in character as Bernie McGloughlin in the film The Commitments, was featured on an Irish postage stamp as part of the Ireland 1996: Irish Cinema Centenary series issued by An Post. The image includes her The Commitments co-stars Angeline Ball as Imelda Quirke, Maria Doyle Kennedy as Natalie Murphy and Robert Arkins as Jimmy Rabbitte.
- "Myspace, Screen West Midlands and Vertigo Films Announce Innovative Plans To Release Faintheart, The Re-enactment Themed Film Filmed On Location In Ludlow, Shropshire". Ludlow & South Shropshire Tourist Information (South Shropshire Tourism Association). 5 January 2009. Retrieved 2009-01-11.
- "Ireland 1996: Irish Cinema Centenary". Emerald Isle Gifts, original stamps from An Post. 1996-10-17. Retrieved 2014-11-19.
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