"Don't Believe a Word" is the first single off of American Alternative Rock group Third Eye Blind's 2009 album, Ursa Major. The song was released on June 5, 2009.


Between the time of song's live debut and the time of its radio release in 2009, "Don't Believe a Word" has undergone numerous lyrical changes. The first major set of changes in the lyrics was seen when the song was released as a mixable track to fans on Indaba Music.

The first known live acoustic performance of the song was given at the Hard Rock Cafe in Boston, MA on May 12, 2009.