David Edward Williams (born 20 August 1971), known professionally as David Walliams (), is an English comedian, actor, writer, and television personality. He is best known for his work with Matt Lucas on the BBC sketch comedy series Little Britain (2003–2006) and Come Fly With Me (2010–2011). From 2012 to 2022, Walliams was a judge on the television talent show competition Britain's Got Talent on ITV. He is also a writer of children's books, having sold more than 37 million copies worldwide.

Walliams played the role of Greville White in the 2007 television drama film Capturing Mary. From 2013 to 2014, he wrote and starred in the BBC One sitcom Big School. In 2015, he starred as Tommy Beresford in the BBC drama series Partners in Crime, and wrote and starred in the sketch comedy series Walliams & Friend. Walliams has won the award for Best TV Judge for his work on Britain's Got Talent at the 2015, 2018, 2019 and 2020 National Television Awards. In 2022, he was a judge on the tenth season of Australia's Got Talent.

Walliams began writing children's novels in 2008 after securing a contract with the publisher HarperCollins. His books have been translated into 53 languages, and he has been described as "the fastest-growing children's author in the UK", with a literary style compared to that of Roald Dahl. Some of his books have been adapted into television films, which he has also appeared in, including Mr Stink (2012), Gangsta Granny (2013) and Billionaire Boy (2016). As of 2023, Walliams book sales stand at over 50 million copies sold worldwide.

Walliams was appointed Officer of the Order of the British Empire (OBE) in the 2017 Birthday Honours for services to charity and the arts. His charity work includes swimming the English Channel, Strait of Gibraltar and River Thames, raising millions of pounds for the BBC charity Sport Relief.