PJ Gallagher is a comedian from Dublin. He starred in RTÉs Naked Camera from 2005 to 2007. He is a graduate of the Gaiety School of Acting and performed in the 2016 Dublin Theatre Festival in Alien Documentary, directed by Una McKevitt. They worked together again on Madhouse which premiered at the Dublin Fringe Festival in 2018. He also appeared in the IFTA-winning 2016 film The Young Offenders and in the three subsequent RTÉ/BBC TV series inspired by the film. His bestselling memoir Madhouse was published in 2023 and was nominated for an Irish Book Award.