Catherine Walker (born 1975 in Dublin) is an Irish actress, notable for British and Irish television appearances including The Clinic (2003–2009), Northanger Abbey (2007), Bitter Sweet  (2007), Critical (2015) and A Dark Song (2016). More recently, she appeared as Madame Scarron / Madame de Maintenon in series 2 of the TV series Versailles. She 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.

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