The Unbelievable Truth is a BBC radio comedy panel game made by Random Entertainment, devised by Graeme Garden and Jon Naismith. It is very similar to the occasional I'm Sorry I Haven't A Clue game "Lies, All Lies", which was first played in 1985.The game is chaired by David Mitchell and is described in the programme's introduction as "the panel game built on truth and lies." The object of the game is to lie on a subject, whilst also trying to include the truth without being detected. The series was first broadcast as a pilot on 19 October 2006, with the first actual series broadcast on 23 April 2007. Its latest, seventeenth, series was aired from October to November 2016.
The concept is similar to that of the radio panel game "Many a Slip", devised by Ian Messiter, which ended in 1979, in which contestants do the opposite – spot errors hidden in narrations of true facts.