Monroe Jackson Rathbone V (born December 21, 1984) is an American actor and singer.

Rathbone was born in Singapore, the son of American parents Randee Lynn (nee Brauner) and Monroe Jackson Rathbone IV. His great-grandfather, Monroe Jackson Rathbone II, was the chairman of Standard Oil of New Jersey, which later became Exxon; Because of his father's job at Mobil Oil, Rathbone has lived in places ranging from Indonesia to Midland, Texas. He started out in local theatre in Midland with the youth actors program "The Pickwick Players", initially doing musical theatre. For his junior and senior years of high school, Rathbone attended the Interlochen Arts Academy, a private school for the arts in Michigan, where he majored in acting. After graduation, he had planned to go to the Royal Scottish Academy of Music and Drama, but went instead to Los Angeles to experiment with film acting.

After being in Los Angeles for a short time, Rathbone was cast in Disney 411, where he interviewed up-and-coming personalities like Hilary Duff and the sister duo Aly & AJ. He has also had guest roles on The O.C. and Close to Home. His film roles include work in Molding Clay, Pray for Morning and Travis and Henry. In 2005, he scored the role of Nicholas Fiske in ABC Family's original series Beautiful People. In a 2008 interview, he stated it was his first leading man role and was his most difficult role to fit into.

In 2008, he played Jasper Hale in the film Twilight, based on the best-selling novel by Stephenie Meyer. He reprised his role in the sequels to Twilight, The Twilight Saga: New Moon, The Twilight Saga: Eclipse and The Twilight Saga: Breaking Dawn.] In 2009, Rathbone played Jeremy in S. Darko. In addition to that role, he won kudos for his performance as a serial killer on Criminal Minds. Rathbone played the role of Sokka in The Last Airbender, a 2010 film based on the animated series. The Last Airbender has caused controversy because of the casting of white actors like Rathbone to play Asian characters. Rathborne stated, "I think it's one of those things where I pull my hair up, shave the sides, and I definitely need a tan. It's one of those things where, hopefully, the audience will suspend disbelief a little bit."

Rathbone enjoys music, writing, singing and producing. He performs in a band called "100 Monkeys" with two friends whom he met in high school at Interlochen Arts Academy, Ben Graupner and Ben Johnson as well as close friends Jerad Anderson and M. Laurence Abrams aka Uncle Larry. The band released three albums in 2009. In December 2009, 100 Monkeys began a 100-city tour that will take them to nearly every state in the US by mid-2010. Rathbone resides in Los Angeles.

J. Action - parts made in indonesia, assembled in singapore, raised on airplane peanuts and bathed in airport restroom sinks, he was saved by texas. given a guitar and a coat he accidentally ventured into the unknown... a wormhole opened, and he found himself in La La Land. he learned how to stand where they told him to, say what they told him to and never lie. rescued by the 100 Monkeys, he now swings about the stage in gratitude.