James Lafferty or James Martin Lafferty (born July 25, 1985) is an American actor, director and producer. He currently portrays Nathan Scott on the CW television drama One Tree Hill. In addition to his role on the young adult drama, Lafferty is also known for his appearance as Justin in S. Darko, the 2009 sequel to the 2001 film Donnie Darko.
In 2001, James Lafferty was cast in the short-lived television series Emeril, where he portrayed Emeril's son Justin. He has also made guest appearances on Once and Again, Get Real, and Boston Public. This was followed by his role as Steve Alford in the ESPN made-for-television movie A Season on the Brink, a basketball film about the 1985-1986 season of Indiana University's men's basketball team. It was based on the book by John Feinstein.
In 2003, James Lafferty was cast in CW's new teenage drama One Tree Hill, where he portrayed the younger half-brother to series lead Lucas Scott play by Chad Michael Murray, bad boy basketball star Nathan Scott. Of the original five main cast members who portrayed students at the fictional Tree Hill High School, he was the only teenager when the show debuted in September 2003. He also will play in Lost on Purpose as Fever and Sam as Sam Wellman.