Julia Charlotte L. Davis (born 25 August 1966) is an English comedian, actress, writer, and director. She is known for writing and starring in the BBC Three comedy Nighty Night (2004–2005) and the comedies Hunderby (2012–2015) and Camping (2016), which she also directed. An eight-time BAFTA TV Award nominee, she won Best Comedy Writing for Hunderby in 2013. She is also known for playing Dawn Sutcliffe in Gavin & Stacey (2007–2009, 2019). Her film roles include Love Actually (2003), Cemetery Junction (2010) and Four Lions (2010) and the critically acclaimed Phantom Thread (2017) starring Daniel Day-Lewis.
Davis created Sally4Ever in 2018, which won a British Academy Television Award for Best Scripted Comedy in May 2019.