Joanne Froggatt (born 23 August 1980) is a British actress. From 2010 to 2015, she portrayed Anna Bates in the ITV period drama series Downton Abbey, for which she received three Emmy nominations and won the 2014 Golden Globe Award for Best Supporting Actress. From 2017 to 2020, she starred as Laura Nielson in the ITV/Sundance drama series Liar.

Froggatt rose to prominence with her portrayal of Zoe Tattersall on the soap opera Coronation Street (1997–1998). She played Ruth Tyler, Sam Tyler's mother in original UK version of the fantasy police drama Life on Mars (British TV series) (2006). She went on to star in the television films Danielle Cable: Eyewitness (2003), See No Evil: The Moors Murders (2006), and Murder in the Outback (2007), before winning the British Independent Film Award for Most Promising Newcomer for her leading role in In Our Name (2010). Other film credits include Filth (2013), A Street Cat Named Bob (2016), Mary Shelley (2017), and Downton Abbey (2019).