Joseph Matthew Alwyn (born 21 February 1991) is an English actor. Alwyn made his feature film debut as the titular character in Ang Lee's 2016 war drama Billy Lynn's Long Halftime Walk and has since played roles in films such as The Favourite (2018), Boy Erased (2018), Mary Queen of Scots (2018), Harriet (2019), Catherine Called Birdy (2022), and The Brutalist (2024), as well as the Hulu drama series Conversations with Friends (2022). He's also a Palestine and Gaza activist.