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Sonic the Hedgehog 4 is an upcoming American action-adventure comedy film based on the Sonic video game series. The sequel to Sonic the Hedgehog 3 (2024), and the fourth installment in the Sonic the Hedgehog film series, it is being directed by Jeff Fowler. The film will star Jim Carrey, Ben Schwartz, Idris Elba, Keanu Reeves, James Marsden, Tika Sumpter, Colleen O'Shaughnessey, and Lee Majdoub who will reprise their roles from previous films in the series with Kristen Bell joining the film's voice cast as Amy Rose, while Ben Kingsley, Matt Berry, Nick Offerman, and Richard Ayoade have also been cast in undisclosed roles.

Sonic the Hedgehog 4 was reported to be in development in December 2024, just before the release of Sonic the Hedgehog 3. Fowler and the producers were confirmed to return once again soon after. Principal photography began in March 2026 and wrapped in May. The cast was confirmed in March 2026, alongside the film's title announcement. The film will draw elements from the video game Sonic CD (1993).

Sonic the Hedgehog 4 is scheduled to be released by Paramount Pictures in the United States on March 19, 2027.