Castine is a town in Hancock County, Maine, United States and served as the capital of Acadia (1670–1674). The population was 1,343 at the 2000 census. Castine is the home of Maine Maritime Academy, a four-year institution that graduates officers and engineers for the United States Merchant Marine and marine related industries. Approximately 850 students are enrolled. During the French colonial period, Castine was the southern tip of Acadia and briefly served as the capital of the region.