Berwick is a town in York County, Maine, United States. The population was 7,246 at the 2010 census. It is situated beside the Salmon Falls River.
Berwick is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area.
Originally part of Kittery, Berwick was first settled about 1631 and called Kittery Commons or Kittery North Parish. It also would be called Unity after the sailing vessel Unity, which transported to America Scots prisoners of war captured at the Battle of Dunbar in 1650. They were force-marched to Durham Cathedral in Durham, England, then tried for treason for supporting Charles II rather than Oliver Cromwell, Lord Protector.