Aidan Murphy (born 24 April 1968), better known as Aidan Gillen (, Irish: Aodhán Ó Giolláin), is an Irish actor. He is known for his film and television roles including Stuart Alan Jones in the Channel 4 series Queer as Folk (1999–2000), Tommy Carcetti in the HBO series The Wire (2004–2008), John Boy in the RTÉ series Love/Hate (2010–2011), Petyr "Littlefinger" Baelish in the HBO series Game of Thrones (2011–2017), CIA operative Bill Wilson in The Dark Knight Rises (2012), Janson in Maze Runner: The Scorch Trials (2015) and Maze Runner: The Death Cure (2018), Aberama Gold in the BBC One series Peaky Blinders (2017–2019), Queen's manager John Reid in Bohemian Rhapsody (2018), and Dr. J. Allen Hynek in The History Channel's Project Blue Book (2019–2020). He also provided the voice and motion capture for Paul Serene in the 2016 video game Quantum Break. In 2021, he had a role in the dramatic crime series Mayor of Kingstown.
Gillen has won three Irish Film & Television Awards and has been nominated for a British Academy Television Award, a British Independent Film Award, and a Tony Award.
Gillen resides in his native Dublin. He met Olivia O'Flanagan when they were teenagers. They have two children: Berry (born c. 1997) and Joe (born c. 2000). They married in 2001 and separated in 2005.Gillen has been in a relationship with singer Camille O'Sullivan since 2014.
Gillen was born Aidan Murphy in the Drumcondra area of Dublin on 24 April 1968, the youngest of six children born to Patricia (née Gillen) and Denis Murphy. He was educated at St. Vincent's C.B.S. in Dublin's Glasnevin neighbourhood.Gillen began his acting career as a teenager, joining the National Youth Theatre at the age of fourteen and playing Nick Bottom in a production of A Midsummer Night's Dream at the Project Arts Centre when he was sixteen. The name Aidan Murphy was already registered so he began using his mother's maiden name as a stage name. He moved to London in 1987 when he was nineteen.