William Spotswood Green CB (10 September 1847 – 22 April 1919) was an Irish naturalist, who specialised in marine biology.
He had already worked on marine biology before he left the services of the Church in 1890: in the 1880s, he participated as a leading member in several research expeditions sponsored by the Royal Irish Academy.
Combined with this work he was a Commissioner on the Congested Districts Board, where his intimate knowledge of human conditions in western Ireland was of great service.
[5] In 1882, he attempted with two Swiss guides a first ascent of Mount Cook in New Zealand, but the party was forced back by bad weather shortly before they reached the top.
In the late 1880s Green did survey work in the Rocky Mountains of British Columbia, including the first ascent of Mount Bonney in 1888.