Under the Blacklight is the fourth and final studio album released by American alternative rock band Rilo Kiley.

Several tracks from Blacklight were leaked in advance of the album's official release date.

The band's first official major label debut features a number of guests musicians, including Jackson Browne, Alex Greenwald of Phantom Planet and James Valentine and Mickey Madden from Maroon 5.

"Breakin' Up" was heard at the end of the Grey's Anatomy season 4 episode "Forever Young".

"The MoneyMaker" was used as the background music in promotional spots for Fox Network's "Canterbury's Law" and a 2009 Carl's Jr. ad featuring Audrina Patridge.

"15" was included in the "Clearance Sale" show of Season 3 of Bob Dylan's Theme Time Radio in April 2009.

It is "an album written about Los Angeles' sketchy side... of characters starving for fame and fortune".