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South Berwick is a census-designated place and the primary village in the town of South Berwick in York County, Maine, with a population of 3,825 at the 2020 census.

The CDP covers 2.82 square miles, of which 2.75 square miles are land, and its ZIP code is 03908.

South Berwick was first listed as a census-designated place prior to the 2020 census.

The village sits in the northwestern corner of the town, bordered to the north by the town of Berwick and to the southwest, across the Salmon Falls River, by Rollinsford, New Hampshire.

The area was called Newichawannock by the Abenaki people, meaning "river with many falls", a reference to the Salmon Falls River, and was first settled by Europeans about 1631 as part of Kittery.

In 1634 William Chadbourne, James Wall and John Goddard arrived from England aboard the ship Pied Cow to build a sawmill and gristmill at Assabumbadoc Falls.

The Portsmouth Manufacturing Company built a cotton textile mill at Quampheagan Falls on the Salmon Falls River in 1831, with 7,000 spindles and 216 looms producing 2 million yards of sheeting per year by 1868; the mill closed in 1893 and its Greek Revival counting house is now the Old Berwick Historical Society Museum.

The village center was listed on the National Register of Historic Places in 2010.

Local author Sarah Orne Jewett set her 1901 historical romance "The Tory Lover" at the Hamilton House, built about 1785, and her own house, built in 1774 overlooking Central Square, is also a museum operated by Historic New England.

Maine State Route 4 passes through the center of the village, leading 17 miles northeast to Sanford and southwest across the Salmon Falls River to Dover, New Hampshire, while State Route 236 leads northwest to Berwick village and south to Kittery.