The Isle of Man is a British island.
Crown dependencies . They are independently administered jurisdictions , and do not form part of either the United Kingdom or the British Overseas Territories . The Isle of Man ( [ ˈmæn ] Mannin [ ˈmanɪn ] or Ellan Vannin [ ˈɛlʲən ˈvanɪn ] ) , also known simply as Mann , is a self-governing crown dependency in the Irish Sea between the islands of Great Britain and Ireland .