Robert Earl Buckley (born May 2, 1981) is an American actor, best-known for his roles on the television series iZombie and One Tree Hill.A native of Claremont, California, Buckley earned an economics degree from the University of California, San Diego. As a college student, Buckley appeared as a contestant on The Price is Right. One of his bids was for $1 less than another contestant. After working as an economic consultant he moved to Los Angeles to pursue a career in acting.

In 2006, Buckley made his acting debut as a series regular portraying the role of Michael Bauer on the television series Fashion House, which premiered on September 5, 2006 to 1.3 million viewers. The series dipped in ratings dramatically and ended on December 5, 2006 as per the MyNetwork 13 week format.

In 2006, he signed a deal with MyNetworkTV to again appear in another television series. He portrayed the role of Matthew Wakefield in the series American Heiress. The series which consisted of 65 episodes premiered on March 13, 2007 in two-hour instalments. The series switched to one-hour slots in further broadcasting and was cancelled on July 18, 2007. 39 episodes remained unaired in America but managed to air all episodes worldwide. 20th Century Fox Home Entertainment has no plans to release the series on DVD. That same year Robert appeared on an episode of Ghost Whisperer.

In 2008, he successfully auditioned for the recurring role of Kirby Atwood on the television series Lipstick Jungle as an “up and coming photographer who becomes infatuated with Kim Raver’s character Nico Rielly”. The series premiered to a relatively low 7.5 million viewers on February 7, 2008. The series which received a mixed critical reception from critics, slipped in ratings dramatically. The series was renewed for a second season in April 2008. The second season premiered on September 24, 2008 to a low 6.8 million viewers. With ratings downsliding to the 3-4 million mark, the series was cancelled for in March 2008.

In 2009 The CW announced Buckley signed on to appear in a two-episode arc on the television series, Privileged as David Besser. In June 2009 it was announced Buckley signed on as a series regular on One Tree Hill, as Clay Evans. The series seventh season premiered on September 14, 2009 to 2.45 million viewers. After contract disputes with the series cast, an eighth season has been renewed. Buckley will reprise his role of Clayton once again as a series regular on the eighth season, which premieres on September 14, 2010

In 2012, he joined the cast of the ABC supernatural drama series 666 Park Avenue as Brian Leonard.

Buckley currently stars in the CW sci-fi dramedy iZombie as Major Lilywhite.