Knightley appeared in several television movies in the mid to late 1990s, before being cast as Sabé, Padmé Amidala's decoy, in the 1999 science fiction blockbuster Star Wars Episode I: The Phantom Menace. Knightley was cast in the role due to her close resemblance to Natalie Portman, who played Padmé; the two actresses' mothers had difficulty telling their daughters apart when the girls were in full makeup. Knightley's first starring role followed in 2001, when she played the daughter of Robin Hood in the made-for-television Walt Disney Productions feature, Princess of Thieves. During this time, Knightley also appeared in The Hole, a thriller that received a direct-to-video release in the United States. She appeared in a miniseries adaptation of Doctor Zhivago that first aired in 2002 to mixed reviews but high ratings.

Knightley's breakthrough role was in the football-themed film, Bend It Like Beckham, which was a success in its August 2002 UK release, grossing $18 million,