Plum island is a barrier island off the northern coast of Massachusetts, where the Parker and Merrimack Rivers flow into the Gulf of Maine. It contains a mix of summer and year-round residents, as well as a wildlife refuge and a state park.

Plum Island is split between Newburyport, Newbury, Rowley and Ipswich. The island is best known as an outstanding birding location, as it is a stop-off point on many migration paths.