Brett Dennen (born 1979) is a folk/pop singer-songwriter from Oakdale, California. He has been compared to Bob Dylan, Tracy Chapman, James Taylor, and Paul Simon.
In 2004, Dennen released his first self-titled album, Brett Dennen. His second album was So Much More, which includes the singles "Ain't No Reason", "She's Mine", and "Darlin' Do Not Fear". A few songs charted as iTunes top downloads in the days following the album's release in November 2006.  Dennen also contributed a cover of "Private Life" to the 2006 tribute album Drink To Bones That Turn To Dust: A Toast To Oingo Boingo.
Dennen's music has been featured in several television shows, including Grey's Anatomy, the House episode "Family", The Unit episode "Freefall", and the Scrubs episode "My No Good Reason". In addition to television series, Dennen's music has also been used in national advertising campaigns for companies such as Hilton Hotels.
He has toured extensively across the U.S. with his band (including drummer Randy Schwartz), supporting such musicians as John Mayer and guitar duo Rodrigo y Gabriela. As of fall 2007, he is currently touring with singer-songwriters Meiko and Joshua James.