Cillian Murphy is an Irish actor. He made his professional debut in Enda Walsh's 1996 play Disco Pigs, a role he later reprised in the 2001 screen adaptation. His early film credits include the horror film 28 Days Later (2002), the dark comedy Intermission (2003), the thriller Red Eye (2005), the Irish war drama The Wind That Shakes the Barley (2006), and the science fiction thriller Sunshine (2007). He played a transgender Irish woman in the comedy-drama Breakfast on Pluto (2005), which earned him a Golden Globe Award nomination.

Murphy began his collaboration with filmmaker Christopher Nolan in 2005, playing the Scarecrow in The Dark Knight trilogy (2005–2012) as well as appearing in Inception (2010) and Dunkirk (2017). He gained greater prominence for his role as Tommy Shelby in the BBC period drama series Peaky Blinders (2013–2022) and for starring in the horror sequel A Quiet Place Part II (2020). Murphy portrayed J. Robert Oppenheimer in Nolan's Oppenheimer (2023), for which he received the Academy Award for Best Actor, along with a BAFTA Award, a SAG Award and a Golden Globe Award.

In 2011, Murphy won the Drama Desk Award for Outstanding Solo Performance for the one-man play Misterman. In 2020, The Irish Times named him one of the greatest Irish film actors of all time.