Alcock Island (64°14′S61°8′W) is an island lying west of Charles Point in Hughes Bay, off the west coast of Graham Land. The name Penguin Island was used for the feature by whalers operating in the area in 1922. Since this name has not been used on published maps and is a duplication of an earlier name, it has been rejected and a new name substituted. Alcock Island is for Sir John W.