"South Island" may refer to:
- South Island, the location in the Sonic the Hedgehog series.
- South Island (Classic Sonic's world), the location in Classic Sonic's world.
- South Island (Sonic the Comic), the location in the Sonic the Comic series published by Fleetway Editions.
- South Island (Archie), the location in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics.
- South Island (Sonic the Hedgehog: The Movie), the location in Sonic the Hedgehog: The Movie.
- South Island (Sonic the Fighters), the arena in Sonic the Fighters.
- Neo South Island Zone, the Zone in Sonic the Hedgehog Pocket Adventure.
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