Two ships of the Royal Navy named HMS Prince William

HRH The Prince William Henry, later William IV

HRH Prince William Arthur Philip Louis of Wales, son of Charles, Prince of Wales, grandson of Elizabeth II of the United Kingdom

Prince William County, Virginia

HRH Prince William Henry, Duke of Gloucester, son of Frederick, Prince of Wales

HRH Prince William Henry Andrew Frederick of Gloucester, grandson of George V of the United Kingdom

William Adelin, 1103-1120, eldest son of Henry I of England

HRH Prince William Frederick, Duke of Gloucester, son of the above William Henry

Prince William of Hesse, 1787–1867

USS Prince William (CVE-31), an escort carrier of the United States Navy

British tall ship Prince William (ship)

USS Prince William (CVE-19), an escort carrier of the United States Navy

HRH The Prince William Augustus, son of George II, later Duke of Cumberland

Prince William Sound, Alaska