The original inhabitants of the territory that is now Maine were Algonquian-speaking peoples including the Wabanaki, Passamaquoddy, and Penobscots. The first European settlement in Maine was in 1604 by a French party that included Samuel de Champlain, the noted explorer. The French named the area that includes Maine as Acadia. English colonists sponsored by the Plymouth Company settled in 1607. The coastal areas of western Maine first became the Province of Maine in a 1622 land patent. Eastern Maine north of the Kennebec River was more sparsely settled and was known in the 17th century as the Territory of Sagadahock.

The province within its current boundaries became part of Massachusetts Bay Colony in 1652. Maine was much fought over by the French and English during the 17th and early 18th centuries. After the defeat of the French in the 1740s, the territory from the Penobscot River east fell under the nominal authority of the Province of Nova Scotia, and together with present day New Brunswick formed the Nova Scotia county of Sunbury, with its court of general sessions at Campobello. American and British forces contended for Maine's territory during the American Revolution and the War of 1812. The treaty concluding revolution was ambiguous about Maine's boundary with British North America. The territory of Maine was confirmed as part of Massachusetts when the United States was formed, although the final border with British territory was not established until the Webster-Ashburton Treaty of 1842. (Indeed, in 1839 Governor Fairfield declared war on England over a boundary dispute between New Brunswick and northern Maine. Known as the Aroostook War, this is the only time a state has declared war on a foreign power. The dispute was settled, however, before any blood was shed.)

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