Celtic Thunder is a Celtic music group, composed of 5 Celtic male soloists who perform both solos and ensemble numbers. Celtic Thunder debuted in August 2007 at the Dublin City University in Dublin, Ireland.

Since the groups formation, Celtic Thunder has released 2 CDs (Celtic Thunder & Act Two) and a live performance DVD (Celtic Thunder: The Show).

Celtic Thunder is known for its eclectic style with songs ranging from a soloist to ensemble focus. The group is backed by the Celtic Concert Orchestra, and their live shows are known for the use of dramatic effect via lighting and choreography as well as a specifically constructed stage that resembles a ancient stone pathway, similar to Celtic lore.

The members of Celtic Thunder are (in order of youngest to oldest):

Damian McGinty (born September 9, 1992) is the youngest member of the group and is from Derry, Northern Ireland. He is now 16 years old. He recorded the Celtic Thunder album when he was 14, going on 15. Since then McGinty has hit a growth spurt, and is now 5'9'. Mc Ginty has been quoted as saying the first six months of 2008 were the hardest of his Singing career, with him maturing and his voice breaking. The transition is now complete and Mc Ginty's voice is now deep.

Keith Harkin, (born June 10, 1986) Keith is from Derry. He plays the guitar and wrote one of the songs for Celtic Thunder: Lauren and I.  Keith also has his own CD in the works.

Paul Byrom (born April 11, 1979) is from Dublin, Ireland. In addition to Celtic Thunder, he has also sung at major sporting events in Ireland and abroad, including singing at the All Ireland Finals in Dublin's Croke Park, and at Heinz Field for a Pittsburgh Steelers game in the USA. He has also performed for Ireland's President, Mary McAleese, and for Emperor Akihito of Japan.

Ryan Kelly (born November 6, 1978) is from The Moy, County Tyrone, Northern Ireland. He holds two degrees from the Queen's University Belfast, having earned a Bachelor of Science in Accounting, and a Graduate Diploma in Advanced Accounting, making Ryan a qualified Chartered Accountant.

George Donaldson (born February 1, 1968) is the oldest member of the group, and is a well-known balladeer, guitarist, and flutist from Glasgow, Scotland. At Scotland's Celtic Park, Donaldson played to 65,000 fans at the opening match of the 2000/01 season.