Main Island

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