Cushing Island, or Cushing's Island, is a privately owned island in Casco Bay in the U.S. state of Maine. Part of the city of Portland, Maine, roughly 45 families live there seasonally.
In 1623-24 English explorer Christopher Levett built a blockhouse on the island, part of 6,000 acres granted him by the English King. Levett left behind a group of settlers to carry on after he returned to England. But the naval captain and adventurer never returned, and the fate of the men is unknown. After Levett's occupation the island was known as Andrews Island. Levett's early settlement earned him the sobriquet "the pioneer colonist in Casco Bay" from eminent Maine historian James Phinney Baxter.
After a host of owners, in September 1734, Nathaniel Jones conveyed the island to Joshua Bangs. The island was then known as 'Bangs Island'. The name 'Bangs Island' will be found on maps from the period. In the late 1750s Ezekiel Cushing obtained the island from Bangs. In 1760, Bangs regained the island. The island was later conveyed to Jedediah Preble, Joshua Bangs' son-in-law after Bangs' death.