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Catherine Walker (born 1975) is an Irish actress. She has appeared in a number of British and Irish television series, including The Clinic (2003–2009), Northanger Abbey and Waking the Dead (2007), Bitter Sweet (2008), Lewis (2009), The Silence (2010), Strike Back (2013), Critical (2015), A Dark Song (2016) and The Curse of Audrey Earnshaw (2020).

Walker portrayed Madame de Maintenon in series two and three of the TV series Versailles. She also appeared as Alice Brooks in series five of the BBC drama Shetland. In 2020, she appeared in three episodes in the Netflix series Cursed as the recurring character, Lenore, the mother to Nimue from the legends of King Arthur. She also starred in The Deceived as Roisin Mulvery. She had a minor role in the Ridley Scott directed House of Gucci, playing Anna Wintour, the editor-in-chief of Vogue. In 2024, she appeared in the Channel 5 and Acorn TV crime drama series Ellis, playing MP Louise Edwards.

Walker won the Irish Times Irish Theatre Award for Best Actress twice, for What Happened Bridgie Cleary by Tom MacIntyre at the Peacock Theatre and for The Talk of the Town at the Project Arts Centre in Dublin. The Talk of the Town was written by Irish novelist Emma Donoghue, whose best-selling novel Room was subsequently filmed by Lenny Abrahamson.

As of January 2026 Walker is engaged to fellow Irish actor Jason O'Mara who she met in 2022.