Began performing at age six, appeared in films such as Angus, Thongs and Perfect Snogging and The Illusionist before graduating to . Initially credited as Aaron Johnson, he began being billed as Aaron Taylor-Johnson in Anna Karenina (2012); he took the new legal name after marrying Sam Taylor-Wood.

Johnson began acting at the age of six, and performed as the son of Macduff alongside Rufus Sewells Macbeth in 1999, and in Arthur Millers All My Sons in 2000. His TV roles have included his turn as Niker in the BBC's 2004 adaptation of the novel Feather Boy, Aaron in Danny Brocklehurst's ITV1 serial Talk to Me, and Owen Stephens in Nearly Famous.

In 2003, Johnson appeared as a young Charlie Chaplin in Shanghai Knights. In 2006, Johnson appeared in The Illusionist, appearing in the flashback scenes in the beginning of the film as Edward Norton's character as a teenager, Eduard Abramovicz. The scenes show the young Eduard as he first learns magic, and to do this, Johnson himself learned how to perform the ball trick displayed by his character. He also learned how to perform the balancing of the egg on the stick, although that was effected mechanically.

Johnson subsequently appeared as the heartthrob, Robbie, in the 2008 teen comedy Angus, Thongs and Perfect Snogging, alongside The Illusionist co-star, Eleanor Tomlinson. Later, Johnson starred as Lorimer Black in Armadillo, and Prosper in The Thief Lord.

Johnson appeared as John Lennon in the 2009 biopic Nowhere Boy, directed by Sam Taylor-Wood. In 2010, Johnson appeared as Dave Lizewski, the lead character in Matthew Vaughn and Jane Goldman's film Kick-Ass, based on the superhero comic book of the same name by Mark Millar,and has appeared as the central character, William, in Hideo Nakata's Chatroom.

In December 2010, Johnson joined the cast of Albert Nobbs as a replacement for Orlando Bloom, who dropped out of the production due to his wife's pregnancy.Johnson starred in R.E.M.'s 2011 music video berlin which was also directed by his then-fiance

In 2012 he played Count Vronsky in Anna Karenina.

In July 2012, he starred in Oliver Stone's Savages alongside Taylor Kitsch, Blake Lively, Salma Hayek, and John Travolta. HitFix film critic Drew McWeeny was positive of the bond between Johnson and Kitsch which "seems not only credible but lived in and authentic throughout the film", and noted the evolution in maturity of Johnson since Kick-Ass.

Johnson will reprise his titular role in the upcoming sequel Kick-Ass 2 which is scheduled for release on 28 June 2013. Johnson will also star in the upcoming Godzilla reboot scheduled for release on 16 May 2014.

In June 2013, it was reported that Johnson is in early talks to play the role of Quicksilver in the sequel to The Avengers which is scheduled to be released in 2015.

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