Katherine Kelly (born 19 November 1979) is an English actress. A 2001 graduate of the Royal Academy of Dramatic Art, she played Becky McDonald in the ITV soap opera Coronation Street from 2006 to 2012, for which she won Best Actress at the 2009 British Soap Awards and Best Serial Drama Performance at the 2012 National Television Awards. Since 2013, she has starred as Mae, Lady Loxley in the ITV drama series Mr Selfridge.
Kelly's theatre credits include Othello at the Royal Exchange Theatre in 2002, playing Kate Hardcastle in the 2012 National Theatre revival of She Stoops to Conquer, and Alaura in City of Angels at the Donmar Warehouse in 2014. In 2012, she starred in the BBC Four Kenny Everett biopic Best Possible Taste. Her other television credits include The Guilty (2013), The Field of Blood (2013), Happy Valley (2016), The Night Manager (2016), and Doctor Who spin-off series Class (2016).
Kelly was born in Barnsley, South Yorkshire and grew up in both Barnsley and Wakefield, West Yorkshire. She attended Wakefield Girls' High School. She has strong links with The Lamproom Theatre in Barnsley, established in 1998 by her father John (who is originally from Castleisland, County Kerry, Ireland), and has regularly supported fund-raising events held there.