thumb|Green Island in 2009
Green Island, also known as North Brewster Island, is a rocky outer island in the Boston Harbor Islands National Recreation Area, to the north of Calf Island and Hypocrite Channel. The island has a permanent size of , plus an intertidal zone of a further , and is exposed from the east and northeast with little soil or plant life. The island is named after Joseph Green, a well-known merchant, who owned the island during Colonial times.
Green Island is a nesting area for herring gulls, black-backed gulls, cormorants, barn swallows, red-winged blackbirds, and rats. The island is a popular location for striped bass fishermen during the summer months. However, access by humans is difficult, and especially discouraged during the birds' nesting season.
See also
- Great Brewster
- Little Brewster
- Middle Brewster
- Outer Brewster
- Long Island