The final Star Wars film, Episode III: Revenge of the Sith, has been given a 12a certificate by the BBFC.
The rating means no-one younger than 12 can see the film without an adult, who has to watch the film with them.
A warning has also been added by the British Board of Film Classification, saying the film "contains moderate fantasy violence and scary scenes".
It's the first time young children have needed an adult to go with them to watch a Star Wars film.
The BBFC told Newsround that they thought the film was suitable for kids aged 12 and above, but that parents would have to decide whether their children are mature enough to watch Episode III.
The Phantom Menace, A New Hope, Empire Strikes Back and Return of the Jedi are all rated U by the BBFC, while Episode II: Attack of the Clones is a PG.
Revenge of the Sith also got an older rating than other Star Wars films in the US, rated a PG-13.