Sheffield Island Lighthouse is a historic structure located at the southern end of the Norwalk Islands in Norwalk, Connecticut. The light operated from 1828 through 1902. It is built in the same style as the North Lighthouse on Block Island. In 1986 the Norwalk Seaport Association purchased the Sheffield Island Lighthouse. In 1989 the lighthouse and the lighthouse keeper's cottage were placed on the National Register of Historic Places.