Siobhán McSweeney (born 27 December 1977)https://www.youtube.com/watch?v=ubPaTh4f5Cw is an Irish actress and presenter. She is best known for her role as Sister Michael in the teen sitcom Derry Girls which earned her a BAFTA Award.
Early life McSweeney was born and raised in Aherla, County Cork, and attended secondary school at Scoil Mhuire, Cork. Before acting, she earned a science degree at the University College Cork. In 2001, she moved to London when she secured a place at the Central School of Speech and Drama. McSweeney trained under Philippe Gaulier at École Philippe Gaulier in Paris.
Career McSweeney's first role was in 2006 as Julia in the film The Wind That Shakes the Barley. In 2015, she played Una Gilbert in the film Mr. Holmes. The same year, she played Ruth Cheetham in No Offence. In 2016, she played Audrey in As You Like It at National Theatre Live. Later that year, she played the role of Witzender in the film Alice Through the Looking Glass. In 2017, she played a social worker in the short film Big Dog.
From 2018 to 2022, McSweeney played the role of Sister Michael in the Channel 4 sitcom Derry Girls written by Lisa McGee. McSweeney also played Petra in three episodes of Collateral. In 2019, McSweeney played the role of Boring Noreen in the film Extra Ordinary. She also played Alice in the television series Porters on Dave. In 2020, she appeared in the short films The Widow and Scrubber.
Outside acting, McSweeney has also made guest appearances on television shows including Sunday Brunch and Front Row Late. She also appeared on the Derry Girls edition of The Great British Bake Off which aired on 1 January 2020. Since January 2021, she has been the presenter on The Great Pottery Throw Down on Channel 4. She did not appear in the initial episodes of the 2022 series, after breaking her leg in two places. Ellie Taylor stood in for her. In 2023, she appeared in a celebrity episode of Catchphrase winning almost £30,000 for her charity, The Maya Centre in North London.
On 18 December 2024, McSweeney was announced to be host for the first series of The Traitors Ireland. It was broadcast on RTÉ One from 31 August to 23 September 2025. She reprised this role for the second series in 2026.
Personal life On 8 November 2019, McSweeney's flat in London caught fire due to a cube double adaptor that had fallen out of the socket. McSweeney was out at the time but revealed she had developed anxiety following the incident.
Filmography Year Title Role Notes 2006 The Wind That Shakes the Barley Julia Credited as Sabrina Barry 2007 Emmerdale Nurse 2 Episode #1.4703 2011 National Theatre Live: The Kitchen Anne 2013 London Irish Aoife Episode #1.5 2013–2014 The Fall Mary McCurdy 7 episodes2015 Mr. Holmes Una Gilbert Uncredited No Offence Ruth Cheetham 6 episodes2016 National Theatre Live: As You Like It Audrey Alice Through the Looking Glass Witzender 2017 Big Dog Social Worker Short film 2018 Collateral Petra 3 episodes 2018–2022 Derry Girls Sister George Michael Main role; 18 episodes2019 Extra Ordinary Boring Noreen Porters Alice 3 episodes2020 The Widow Eileen Short film Anthony Luighseach Kelly TV film Scrubber Scrubber Short film Nowhere Special Pam2021 The Electrical Life of Louis Wain Dr Cooke Exploring Northern Ireland with Siobhán McSweeney Herself/host 4 episodes 2021–present The Great Pottery Throw Down Herself/host2022 Holding Bríd Riordan 4 episodes Kepler 62F Admiral Pix's sidekick Redemption Jane Connolly 6 episodes Murdoch Mysteries Aunt Oleander 2 episodes Death in Paradise Jennifer Langan Episode: "Christmas Special 2022" 2023 Finding Brigid Host Documentary 2023–2024 Extraordinary Mary 7 episodes2025AmandalandDella Fry Nine Bodies in a Mexican Morgue Lisa Davies Main role2025–present The Traitors Ireland Host 2026The Dickie ShowSelfEpisode 2. Spinoff of Smoggie Queens.
See also List of Irish actors
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