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The 35th anniversary of the Sonic the Hedgehog series, also known as Forever Fast, is a year-long celebration held throughout 2026 to commemorate 35 years since the release of the original Sonic the Hedgehog in 1991. The campaign spans the wider franchise, with anniversary activities encompassing video games, comics, animation and other media, music, merchandise, concerts, exhibitions, collaborations, promotional events and community-focused activities.

Early indications of the anniversary appeared in March 2025, when marketing material for the Sonic the Hedgehog 35th Anniversary 2026 Wall Calendar with 4 Bonus Notecards surfaced ahead of its planned August 2025 release.