Barry Keoghan (/ˈkjoʊɡən/ KYOH-gən; born 18 October 1992) is an Irish actor. His accolades include a BAFTA Award, along with nominations for an Academy Award and two Golden Globe Awards. In 2020, he was listed at number 27 on The Irish Times list of Ireland's greatest film actors.

Keoghan began acting in 2011 and gained recognition in 2017 for his roles in Christopher Nolan's Dunkirk and Yorgos Lanthimos's The Killing of a Sacred Deer. He gained praise for his performances in the Irish crime film Calm with Horses (2019) and in the fantasy film The Green Knight (2021). He expanded to big-budget films with his role as Druig in the Marvel Cinematic Universe film Eternals (2021). In 2022, he appeared in Martin McDonagh's The Banshees of Inisherin, for which he won the BAFTA Award for Best Actor in a Supporting Role and received nominations for the Golden Globe and Academy Award for Best Supporting Actor. Keoghan then starred in the psychological drama Saltburn (2023), for which he gained nominations for a Golden Globe and BAFTA Award for Best Actor.

He has appeared in television, including in the RTÉ drama Love/Hate (2013), the HBO miniseries Chernobyl (2019), the final season of the Netflix reboot Top Boy (2023), and in the Apple TV+ miniseries Masters of the Air (2024). Keoghan is a brand ambassador for Dior and Barretstown.

Keoghan was born on 18 October 1992, and grew up in Summerhill, Dublin, Ireland. His mother experienced drug addiction and died when he was 12. With his brother Eric, he spent seven years in foster care, in 13 foster homes, before being raised by their grandmother, aunt, and older sister Gemma.

As a child, Keoghan appeared in school plays in the O'Connell School on Dublin's North Richmond Street but was banned for "messing about". He attributes his film education to sneaking into films with friends at Cineworld, Parnell Street, from which he was eventually barred. After appearing in Between the Canals, Keoghan studied acting at The Factory (now Bow Street Academy), a local Dublin drama school. He remembers "not even having €2.20 to get the bus to The Factory" at that time.

Keoghan began his acting career in 2011 when he answered a casting notice in a Sheriff Street shop window for the crime film Between the Canals. He portrayed Aido in a small role in the film, which was released in 2011. At the age of 18, he appeared in the Irish soap opera Fair City. In 2013, Keoghan appeared as Wayne on Love/Hate. The role earned Keoghan recognition in Ireland, and he went on to feature in '71 in 2014 and Mammal and Trespass Against Us in 2016.

Keoghan appeared in two films in 2017. He featured as George Mills in Dunkirk and starred as Martin Lang in The Killing of a Sacred Deer alongside Colin Farrell and Nicole Kidman. He won the Irish Film and Television Award for Best Supporting Actor for his work in The Killing of a Sacred Deer. The following year, he appeared in Black '47 as Hobson, an English soldier stationed in Ireland during the Great Famine. He also starred in American Animals the same year. He portrayed Spencer Reinhart in the film, based on a real-life theft of rare books from a university library. In 2018, The Hollywood Reporter described Keoghan as "the next big thing" for his film work in the previous three years.

In 2019, he appeared in the HBO miniseries Chernobyl. and in an episode of Living With Lucy. His work in Calm With Horses was shown in the premiere at the 2019 Toronto International Film Festival. In February 2020, Keoghan left the main series production of Y: The Last Man, in which he had cast lead character Yorick Brown. In 2019, he was nominated for the BAFTA Rising Star Award. In 2021, Keoghan played Druig in the Marvel Cinematic Universe film Eternals, and appeared in The Green Knight.