Matthew Jerome Barr is an American actor. He is known for his roles as Johnse Hatfield in Hatfields & McCoys with Kevin Costner, Mike Fleming in Commander in Chief, Ian Banks in One Tree HillChristopher Sullivan in the mystery-horror limited series Harper's Island, and Dan Patch in The CW's series Hellcats.

Some of Barr's roles include playing Ian Banks, Peyton Sawyer's (played by Hilarie Burton) stalker on One Tree Hill. Barr has also portrayed guest and recurring roles on popular television series ERBonesThe O.C. and Commander in Chief. He starred as David Stanley in the direct to DVD film Protecting the King as Elvis Presley's youngest step-brother.

Barr appeared in the 2008 film The House Bunny as Tyler, one of the university's students.

He portrayed David "Puck" Rainey, one of the alumni of The Real World: San Francisco, in Pedro, Nick Oceano's 2008 biographical film on the life of AIDS educator Pedro Zamora. In 2009, Barr co-starred in the mystery/horror miniseries Harper's Island as

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Christopher "Sully" Sullivan. Between 2009 and 2010 he guest starred in many TV series, such as CastleTraumaFriday Night Lights and CSI: Crime Scene Investigation.

Barr was cast as a series regular in the CW series Hellcats playing Dan Patch, in 2010. The series premiered on September 8, 2010. However, after one season the series was cancelled. He had a role as Billy "The Kid" Rhodes on the USA Network series Necessary Roughness in 2011. In 2012, Barr assumed a leading role, starring in the Kevin Costner miniseries Hatfields & McCoys for the History Channel. He portrayed Johnse Hatfield, who fell in love with Roseanna McCoy. Barr was drawn to this part due to the romance and tragedy surrounding the famous feud.