Jack Gleeson (born 20 May 1992) is an Irish actor who is best known for his role as Joffrey Baratheon on the HBO television series Game of Thrones (2011–2014).

[5][6][7] At Trinity, Gleeson was a member of DU Players, where he met his future co-founders of Collapsing Horse Theatre Company.

[14] He was part of the original cast in the company's first theatre production Monster / Clock, a children's theater show which premiered in Dublin in 2012.

[15] He next appeared in the company's "lo-fi comedy" Bears in Space which premiered in Dublin in July 2014 and took part of the 2014 Edinburgh Festival Fringe.

[16] The show was well reviewed and had revival productions in Dublin and London in 2015 and off-Broadway in New York in September 2016 as part of Origin's 1st Irish theatre festival.

[21][22] In August, he made a surprise appearance at Over the Top Wrestling's Trinity Brawl 2 event in Dublin where he played the face, aptly called "TV's Jack Gleeson," opposite Irish wrestler J Money.