Main island is a term for the largest island in a country or group of islands.

Main Island may refer to:

• Grosse Ile (Michigan), an island in Michigan, nicknamed the "Main Island"
• Main Island (Michigan), an island within the state of Michigan
• Main Island, Willis Islands in the South Georgia Islands
• Main Island of Bermuda
• Honshu, Japan
• Singapore Island, Singapore

This disambiguation page lists articles about distinct geographical locations with the same name.
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