Sonic the Hedgehog 3 is a 2024 action-adventure comedy film based on the Sonic video game series. The third in the Sonic film series, it was directed by Jeff Fowler and written by Pat Casey, Josh Miller, and John Whittington. Jim Carrey, Ben Schwartz, Colleen O'Shaughnessey, James Marsden, Tika Sumpter, and Idris Elba reprise their roles, with Keanu Reeves joining the cast. In the film, Sonic, Tails and Knuckles face Shadow the Hedgehog, who allies with the mad scientists Ivo and Gerald Robotnik to pursue revenge against humanity.

Sonic the Hedgehog 3 was announced in February 2022 during ViacomCBS's investor event before the release of Sonic the Hedgehog 2 (2022). Due to the 2023 SAG-AFTRA strike, filming for animated characters began in July 2023 in Surrey, England, and filming with actors began that November in London. Production ended by March 2024. The plot draws elements from the video games Sonic Adventure 2 (2001) and Shadow the Hedgehog (2005). Reeves was cast as Shadow due to the parallels between his performance in the John Wick films and Fowler's vision for the character.

Sonic the Hedgehog 3 premiered at the Empire Leicester Square in London on December 10, 2024, and was released by Paramount Pictures in the United States on December 20. It received critical praise for Carrey and Reeves' performances and was a box office success, grossing $491.9 million worldwide on a budget of $122 million, becoming the highest-grossing film in the franchise, the second highest-grossing video game film at the time of release, and the tenth-highest-grossing film of 2024. A fourth film is due to be released on March 19, 2027.