Celtic Woman is a musical ensemble comprising five Irish female artists: vocaliists Chloë Agnew, Lynn Hilary, Lisa Kelly, Alex Sharpe and fiddler Máiréad Nesbitt. The group's repertoire ranges from traditional Celtic tunes to modern songs. To date, the group has released four albums, Celtic Woman, Celtic Woman: A Christmas Celebration, Celtic Woman: A New Journey and Celtic Woman: The Greatest Journey and have undertaken a number of world tours.

The foundation for Celtic music's popularity outside of Ireland and Europe was previously set by artists Enya and Clannad, along with stage shows Riverdance and Lord of the Dance. To this end, Celtic Woman has been referred to as "Riverdance for the voice."

Celtic Woman was filmed on 15 September 2004 for PBS Television at The Helix, Dublin, Ireland, in front of a sold out audience. Organized by producer Sharon Browne, Chairman & CEO Dave Kavanagh and musical director and composer David Downes, this performance was first broadcast on PBS during March 2005 in the United States, and within weeks the group's eponymous debut album Celtic Woman reached #1 on Billboard's World Music chart, eventually breaking a long-standing record on 22 July 2006 by staying at #1 for 68 weeks, and held that position for 81 weeks total.  Much of the group's success in America has been credited to the extensive PBS publicity throughout 2005. The live performance at The Helix was released on DVD alongside the studio album.

The release of the second album, Celtic Woman: A Christmas Celebration, on 19 October 2006 knocked their first album to the #2 spot on the World Music chart.

In preparation for their third studio album, Celtic Woman performed at Slane Castle in County Meath, Ireland, on 23 August and 24 August 2006, with this show airing on PBS during December 2006. The studio album, titled Celtic Woman: A New Journey, was released on 30 January 2007, and as with their debut, the live performance was released on DVD simultaneously. This album immediately hit the Billboard 200 at #4 and the Billboard World Music chart at #1, bumping their previous two releases down a spot and securing the top three positions on that chart for the group.

In response to the amazing popularity of the performance at Slane Castle in 2006, on 7 December 2007 PBS aired a special concert of Celtic Woman performing again in The Helix Theatre, Dublin, Ireland. This performance included songs from the group's second album Celtic Woman: A Christmas Celebration.

The Irish group released a fourth album called Celtic Woman: The Greatest Journey in October 28, 2008.

The 2009 Isle of Hope Tour was announced in late 2008, and features a blend of original music from composer David Downes and Brendan Graham (the author of the group favorite You Raise Me Up), renditions of songs such as "Fields of Gold" and "Have I Told You Lately That I Love You" and traditional performances of "Danny Boy", "The Sky and the Dawn and the Sun" and "Spanish Lady".