After reuniting with his best friends Ron Weasley and Hermione Granger, Harry learns that Sirius Black, a convicted supporter of the dark wizard Lord Voldemort, has escaped Azkaban prison and intends to kill him. The Knight Bus arrives and takes Harry to the Leaky Cauldron, where he is pardoned by Minister for Magic Cornelius Fudge for using magic outside of Hogwarts. Fed up, Harry then flees the Dursleys with his broom and trunk. When Aunt Marge Dursley insults his parents, he loses his temper and accidentally causes her to inflate like a balloon and float away. Harry Potter has been spending another unhappy summer with the Dursleys. It was followed by Harry Potter and the Goblet of Fire in 2005. It was nominated for two Academy Awards, Best Original Music Score and Best Visual Effects at the 77th Academy Awards in 2004.

The film is credited for marking a notable change in the franchise's tone and directorial style, and is often considered by critics and fans alike to be the best Harry Potter film. Prisoner of Azkaban grossed a total of $796 million worldwide, making it the second-highest-grossing film of 2004, and received praise for Cuarón's direction and the lead actors' performances. The film was released on in the United Kingdom, and on 4 June 2004 in North America, as the first Harry Potter film using IMAX Technology and released into IMAX theatres. It was the first in the series to extensively use real-life locations, with sets built in Scotland and scenes shot in London. Principal photography began in February 2003, at Leavesden Film Studios. It was the first appearance of Michael Gambon as Professor Albus Dumbledore, due to Richard Harris' death in 2002. The cast of previous instalments returned for the film, with the additions of Gary Oldman, David Thewlis, and Emma Thompson, among others.

Cuarón was selected as director from a shortlist that included Callie Khouri and Kenneth Branagh. With Prisoner of Azkaban, production of the Harry Potter films switched to an eighteen-month cycle. The film follows Harry's third year at Hogwarts and his quest to uncover the truth about his past, including the connection recently-escaped Azkaban prisoner Sirius Black has to Harry and his late parents. The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint as Ron Weasley, and Emma Watson as Hermione Granger. Produced by Chris Columbus, David Heyman, and Mark Radcliffe and written by Steve Kloves, it is the sequel to Harry Potter and the Chamber of Secrets (2002) and the third instalment in the Harry Potter film series. Harry Potter and the Prisoner of Azkaban is a 2004 fantasy film directed by Alfonso Cuarón and distributed by Warner Bros.

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