The Root of All Evil?, later retitled The God Delusion, is a television documentary written and presented by Richard Dawkins in which he argues that humanity would be better off without religion or belief in God.

The documentary was first broadcast in January 2006, in the form of two 45-minute episodes, on Channel 4 in the UK.

Dawkins has said that the title The Root of All Evil? was not his preferred choice, but that Channel 4 had insisted on it to create controversy. The sole concession from the producers on the title was the addition of the question mark. Dawkins has stated that the notion of anything being the root of all evil is ridiculous. Dawkins' book The God Delusion, released in September 2006, goes on to examine the topics raised in the documentary in greater detail. The documentary was rebroadcast on the More4 channel on the 25 August 2010 under the title of The God Delusion.