Ruth Alexandra Elisabeth Jones (born 22 September 1966) is a Welsh actress, comedian, writer and producer. She co-wrote and co-starred in the critically acclaimed BBC sitcom Gavin & Stacey (2007–2010, 2019, 2024), for which she won the BAFTA Award for Best Female Comedy Performance in 2025. She also co-wrote and starred in the Sky One comedy-drama Stella (2012–2017), for which she was nominated for the BAFTA Award for Best Female Comedy Performance and the BAFTA Cymru Award for Best Screenwriter.

Jones has appeared in various television series, including Fat Friends (2000–2005), Little Britain (2003–2007), Nighty Night (2004–2005), Saxondale (2006–2007) and The Street (2009). Jones was appointed Member of the Order of the British Empire (MBE) in the 2014 New Year Honours for services to entertainment.