Grass Island is a conspicuous island lying across the entrance to Stromness Harbour in Stromness Bay, South Georgia. It was known as "Mutton Island" as early as 1912, but since 1920 the name Grass Island has been consistently used.
On the 22 and 23 April 1982, after a British Special Boat Service team were driven back by snow at Cumberland East Bay, the Special Air Service was landed on Grass Island from HMS Antrim, and launched their attack on Argentine positions from here.
In 2000, the island became rat-free after a team from New Zealand helped in an extermination.
This article incorporates public domain material from the United States Geological Survey document "Grass Island" (content from the Geographic Names Information System).