While in primary school, Rupert Grint took an avid interest in theatre and started performing in school productions, joining the Top Hat Stage and Screen School, a local theatre group that cast him as a fish in Noah's Ark and a donkey in another nativity play.
A fan of the Harry Potter books, Rupert chose to try out for the role of protagonist Ron Weasley, one of Harry Potter's best friends at Hogwarts. Having seen a Newsround report about the open casting, he sent in a video of himself rapping about how he wished to receive the role. His attempt was successful as the casting team asked for a meeting with him.
The release of Harry Potter and the Philosopher's Stone in 2001 was Grint's debut screen performance. Breaking records for opening-day sales and opening-weekend takings, it was the highest-grossing film of that year. Rupert himself won a Satellite Award in the category of "Outstanding New Talent", and a Young Artist Award for "Most Promising Young Newcomer".
From 2001 to 2011, he starred in all eight Harry Potter films alongside Daniel Radcliffe playing as Harry Potter and Emma Watson playing as Hermione Granger.
In 2002, Grint starred in his first non-Harry Potter film,Thunderpants, which revolves around Patrick (played by Bruce Cook) whose remarkable capacity for flatulence scores him a job as an astronaut. In this film, Grint portrayed the co-lead role of Alan, an anosmic boy who is Patrick's only friend.
Another film he appeared in was Driving Lessons, a comedy-drama released in 2006, where he starred opposite Julie Walters. Jonathan Lynn directed Grint in Wild Target, a 2010 comedy thriller film, which he starred in alongside Emily Blunt and Bill Nighy.
In June 2014, it was announced that Grint would make his Broadway debut as Frank Finger in the play It's Only a Play at the Gerald Schoenfeld Theatre, appearing alongside Matthew Broderick, Nathan Lane, Stockard Channing, and Megan Mullally.