Guy Edward Pearce (born 5 October 1967) is an Australian actor. His accolades include a Primetime Emmy Award, and nominations for an Academy Award, a BAFTA Award, and two Golden Globe Awards.

Born in Cambridgeshire, England, and raised in Geelong, Australia, Pearce received international attention for his break-out roles in The Adventures of Priscilla, Queen of the Desert (1994), L.A. Confidential (1997), Ravenous (1999), and Memento (2000). His subsequent roles were in The Time Machine (2002), The Count of Monte Cristo (2002), Bedtime Stories (2008), The Road (2009), The Hurt Locker (2009), The King's Speech (2010), Lawless (2012), and Mary Queen of Scots (2018). He portrayed Peter Weyland in Prometheus (2012) and Alien: Covenant (2017), and acted in the Marvel Cinematic Universe playing Aldrich Killian in the film Iron Man 3 (2013). In Australian cinema he has acted in The Proposition (2005), Animal Kingdom (2010), The Rover (2014), and Swinging Safari (2018). For his performance as a wealthy industrialist in The Brutalist (2024), he received a nomination for the Academy Award and the BAFTA Award for Best Supporting Actor.

On television, he has played the title role in the series of films Jack Irish (2012–2021). Pearce starred in the HBO miniseries Mildred Pierce (2011) and Mare of Easttown (2021). The former won him a Primetime Emmy Award for Outstanding Supporting Actor.

Pearce was born on 5 October 1967 in Ely, Cambridgeshire, England. His father, Stuart Pearce, was a Royal New Zealand Air Force pilot and RAF test pilot, and his mother, Anne Cocking (née Pickering), was an English schoolteacher. He has an elder sister, Tracy. When Pearce was three years old, the family relocated to Geelong, Victoria, Australia. When he was eight years old, Pearce's father died in an aircraft accident.

Pearce attended Geelong College, and was a member of the Geelong Society of Operatic and Dramatic Arts (GSODA) Junior Players. At the age of 16, he was a competitive amateur bodybuilder, leading to the title of Junior Mr. Victoria. He lived in Box Hill North, Victoria in the late 1980s while working on the Australian drama series Neighbours. His first film appearance, while still at Geelong College, was in a Victorian Vice-Chancellors-funded film Life and Study at University, produced and directed by Peter Lane of Deakin University.

Pearce transitioned to television when he was cast in the Australian soap opera Neighbours in 1986, playing the role of Mike Young for three years. He reprised the role in 2022 for the show's then final episode, and returned to make multiple guest appearances in the revival from 2023 to 2024. Pearce also found roles in other television series such as Home and Away (1988) and Snowy River: The McGregor Saga (1993).

The director/producer/writer Frank Howson cast Pearce in his first three films, Heaven Tonight, Hunting, and Flynn, and paid for him to go to the Cannes Film Festival in 1991 for the premiere of the Howson-directed Hunting. The accompanying Howson-funded publicity campaign brought Pearce to the attention of the international film industry. He made his first major film breakthrough shortly after, with his role as a drag queen in The Adventures of Priscilla, Queen of the Desert in 1994. Since then, he has appeared in several US productions including L.A. Confidential, Ravenous, Rules of Engagement, Memento, The Count of Monte Cristo, and The Time Machine.

Pearce portrayed pop artist Andy Warhol in Factory Girl and Harry Houdini in Death Defying Acts. He also appeared in The Road and in Bedtime Stories with Adam Sandler. Pearce continued to perform in Australian films, such as The Hard Word (2002) and The Proposition (2005), written by fellow Australian Nick Cave.