Mary Rose Byrne (born 24 July 1979) is an Australian actress. Renowned for her versatility across screen and stage, she is particularly recognised for her leading roles in blockbuster comedies, independent dramas, and horror films. Her accolades include a Golden Globe, a Silver Bear and a Volpi Cup as well as nominations for an Academy Award, a BAFTA Award, a Tony Award, and two Primetime Emmy Awards.
Byrne made her screen debut in the film Dallas Doll (1994), and continued to act in Australian film and television throughout the 1990s and early 2000s. She gained her first leading film role in The Goddess of 1967 (2000), which earned her the Volpi Cup for Best Actress at the 57th Venice International Film Festival. She further demonstrated her range as an actress with roles in the comedy The Rage in Placid Lake (2003), the historical drama Marie Antoinette (2006), and the horror film 28 Weeks Later (2007).
Byrne established herself as a prominent comedienne with roles in films such as Get Him to the Greek (2010), Bridesmaids (2011), Neighbors (2014), Spy (2015), Neighbors 2: Sorority Rising (2016), and Instant Family (2018). During this period, she also starred in the horror franchise Insidious (2010–2023), the X-Men prequel films (2011–2016), and the family comedy films Peter Rabbit (2018) and Peter Rabbit 2: The Runaway (2021). For her performance as a troubled mother in the psychological drama If I Had Legs I'd Kick You (2025), she received the Silver Bear and the Golden Globe Award as well as a nomination for the Academy Award for Best Actress.
On television, Byrne starred as Ellen Parsons in the legal thriller series Damages (2007–2012), which earned her two consecutive Primetime Emmy Award nominations. She portrayed Gloria Steinem in the miniseries Mrs. America (2020), and led the Apple TV comedy series Physical (2021–2023) and Platonic (2023–present). She starred on Broadway in a revival of the screwball comedy You Can't Take It With You (2014–2015) and in the Noël Coward farce Fallen Angels (2026), the latter of which earned her a Tony Award for Best Actress in a Play nomination.
Mary Rose Byrne was born on 24 July 1979 in the Sydney suburb of Balmain. She has Irish and Scottish ancestry. Byrne is the youngest of four children born to Jane and Robin Byrne. She has an older brother, George, and two older sisters, Lucy and Alice. In a 2009 interview, Byrne said that her mother was an atheist, while both she and her father were agnostic. Her family was described by The Daily Telegraph as "close-knit", and frequently kept her grounded as her career took off.
Byrne attended Balmain Public School, Australian Theatre for Young People (at age eight, encouraged by one of her sisters), and Hunters Hill High School before attending Bradfield Senior College for years 11 and 12.
She later lived in the Sydney suburbs of Newtown and Bondi. She auditioned for several major Australian drama schools, including Nepean, Western Australian Academy of Performing Arts (WAAPA), and National Institute of Dramatic Art (NIDA), but was not accepted into any of them. Instead, she studied an arts degree at Sydney University.
In 1999, she studied acting at the Atlantic Theater Company, which was developed by David Mamet and William H. Macy.
Byrne obtained her first film role in Dallas Doll (1994) when she was 15 years old. Throughout the 1990s, she appeared in several Australian television shows, such as Wildside (1997) and Echo Point (1995), and starred as the love interest in the film Two Hands (1999), opposite fellow up-and-coming actor Heath Ledger. A role in the award-winning film My Mother Frank (2000) was followed by her first leading role in Clara Law's The Goddess of 1967 (also 2000), which gained her the Volpi Cup for Best Actress at the 57th Venice International Film Festival. Byrne revealed in a post-award interview that, prior to winning the Venice Film Festival Award, she was surprised by her own performance and found it confronting watching the film because her acting was "too depressing". Byrne admitted that "watching myself is confronting because I'm convinced I can't act and I want to get out, that's how insecure I am."
On stage, Byrne starred in La Dispute and in a production of Anton Chekhov's classic Three Sisters at the Sydney Theatre Company. In 2002, she made a brief appearance as Dormé, the handmaiden to Natalie Portman's Senator Padmé Amidala, in George Lucas's Star Wars: Episode II – Attack of the Clones. She then transitioned to Hollywood as she appeared in the 2002 thriller City of Ghosts, with Matt Dillon. Byrne had flown to the UK to shoot I Capture the Castle (2003), Tim Fywell's adaptation of the 1948 novel of the same title by Dodie Smith. In it, she portrayed Rose Mortmain, the elder sister of Romola Garai's Cassandra.
In 2003, Byrne starred in three Australian films; The Night We Called It a Day, with Melanie Griffith and Dennis Hopper; The Rage in Placid Lake, with Ben Lee; and Take Away, alongside Vince Colosimo, Stephen Curry, John Howard and Nathan Phillips. All films were comedies and opened to varying degrees of success at the box office, but The Rage in Placid Lake earned Byrne an AACTA Award nomination for Best Actress. In the epic drama Troy (2004), she took on the role of Briseis, the captured priestess presented to "amuse" Brad Pitt's Achilles. Variety's review of the film stated: "Byrne's spoils-of-war chattel plays more as a convenient invention than as a woman who could possibly turn Achilles' head and heart around". In her other 2004 film release, the thriller Wicker Park, Byrne appeared, opposite Josh Hartnett and Diane Kruger, as the girlfriend of a young advertising executive's old friend. Wicker Park director Paul McGuigan described her as the best actress he has worked with, and her Troy co-star Peter O'Toole described her as "beautiful, uncomplicated, simple, pure actress and a very nice girl".
Byrne reunited with Peter O'Toole, playing a young servant, in the BBC TV drama Casanova (2005), a three-episode production about 18th century Italian adventurer Giacomo Casanova. In 2005, she also starred with Snoop Dogg in The Tenants, based on Bernard Malamud's novel. In 2006, Byrne portrayed Gabrielle de Polastron, duchesse de Polignac, a French aristocrat and friend of Marie Antoinette, in Sofia Coppola's Marie Antoinette, with Kirsten Dunst; and appeared as a medical examiner who thinks the dead woman she is prepping is her missing sister in the critically acclaimed thriller The Dead Girl, directed by Karen Moncrieff.
2007–2010: Damages and comedic film roles
In 2007, Byrne had significant parts in two studio sci-fi thriller films. She played a space vessel's pilot in Danny Boyle's Sunshine, alongside Cillian Murphy and Chris Evans, and also an army medical officer in Juan Carlos Fresnadillo's 28 Weeks Later, the sequel to Boyle's 28 Days Later. While Sunshine flopped, 28 Weeks Later was a critical success and grossed over US$64.2 million globally. In 2007, Byrne began playing Ellen Parsons, a bright, young attorney, in the FX legal thriller television series Damages, alongside Glenn Close. Her performance was widely praised; she was nominated for Primetime Emmy Awards for Outstanding Supporting Actress in a Drama Series in 2009 and 2010, and for Golden Globe Awards for Best Supporting Actress – Series, Miniseries, or Television Film in 2008 and 2010. She appeared in all 59 episodes of the series until its finale in September 2012.
Following starring roles in the 2008 independent films Just Buried, directed by Chaz Thorne, and The Tender Hook, with Hugo Weaving, Byrne returned to the mainstream with the role of the mother of a teen, alongside Nicolas Cage, in the sci-fi thriller Knowing (2009); it made US$186.5 million worldwide and received mixed reviews. Byrne said she had not yet become strategic about her film choices. "You gravitate to where you want to go, but so much is out of your control", she remarked. After the success of Damages, she asked her agents to send her out for comedies. "I was doing all of this really heavy, dramatic stuff, and I just needed a break,” she said. Her request was met when she obtained the role of a scandalous pop star and the on-and-off girlfriend of a free-spirited rock star in the comedy Get Him to the Greek (2010), also starring Russell Brand and Jonah Hill. Director Nicholas Stoller admitted that, in her audition, he thought: "'Why is she here?' Because, you know, very good actress, but very serious". Nevertheless, he noted that Byrne "just destroyed [...] Like, destroyed in the way that someone from Saturday Night Live would. And that was that". The film was a commercial success, with a gross of US$60.9 million in North America.