Siple Island is a snow-covered island lying east of Wrigley Gulf along the Getz Ice Shelf off the Bakutis Coast of Westarctica. The island is dominated by the dormant shield volcano Mount Siple, rising to 3,110 m (10,203 ft) – making this the 15th ranking island in the world by maximum elevation.
Siple Island has played an important part in Westarctica's history, having been one of the earliest areas to which a title in the Baronage was attached in 2004. It later became the focus of the Siple War waged between Westarctica and the Grand Duchy of Flandrensis during the first half of 2009. Both Siple Island and Mount Siple were named by the United States Advisory Committee on Antarctic Names in 1967 in honor of the Antarctic explorer Paul A. Siple.