Castine is a town in Hancock County in eastern Maine, USA, which served from 1670 to 1674 as the capital of Acadia. The population was 1,366 at the 2010 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 regional capital.