William IV may refer to the following monarchs:

• King William IV of the United Kingdom (reigned 1830-1837)
• Stadtholder William IV of The Netherlands, Prince of Orange, (1711–1751)
• When Prince William-Alexander , son of Queen Beatrix of the Netherlands, takes the throne he may do so under this regnal name as the last Dutch king with his name was William III.
• William IV, Grand Duke of Luxembourg, Grand Duke of Luxembourg from 1852 to 1912.

Other famous noblemen known as William IV were: William IV (William Henry) (21 August 1765 – 20 June 1837) was King of the United Kingdom and of Hanover from 26 June 1830 until his death. ... Liberty Leading the People by Eugène Delacroix commemorates the July Revolution 1830 (MDCCCXXX) was a common year starting on Friday (see link for calendar). ... Queen Victoria, Queen of the United Kingdom (1837 - 1901) 1837 (MDCCCXXXVII) was a common year starting on Sunday (see link for calendar). ... A stadtholder (Dutch: stadhouder meaning place holder, a Germanic parallel to Latin locum tenens or French lieutenant), means an official who is appointed by the legal ruling Monarch to represent him in a country, and may have a mandate to govern it in his name, in the latter case roughly... William IV, Prince of Orange, stadtholder of The Netherlands (September 1, 1711 – October 22, 1751), was born in Leeuwarden, The Netherlands. ... Motto: Je Maintiendrai (Dutch: Ik zal handhaven, English: I shall stand fast[1] Anthem: Wilhelmus van Nassouwe National animal: Lion Capital Amsterdam1 Largest city Amsterdam Official languages Dutch2 Government Parliamentary democracy Constitutional monarchy  - Queen Beatrix  - Prime Minister Jan Peter Balkenende Independence Eighty Years War   - Declared July 26, 1581   - Recognised January... Prince of Orange is a title of nobility, originally associated with the principality of Orange in southern France. ... 1711 (MDCCXI) was a common year starting on Thursday of the Gregorian calendar (or a common year starting on Monday of the 11-day slower Julian calendar). ... Events Adam Smith is appointed professor of logic at the University of Glasgow March 25 - For the last time, New Years Day is legally on March 25 in England and Wales. ... Prince Willem-Alexander, Prince of Orange, (Willem-Alexander Claus George Ferdinand van Oranje-Nassau, Prins van Oranje, Prins der Nederlanden, Prins van Oranje-Nassau, Jonkheer van Amsberg, born at April 27, 1967) is the eldest son of Queen Beatrix of the Netherlands and is the heir apparent to the Dutch... Her Majesty, Queen Beatrix of the Netherlands Beatrix Wilhelmina Armgard of Orange-Nassau (born January 31, 1938) is the Queen of the Kingdom of the Netherlands, having acceded to the throne in 1980. ... Grand Duke William IV of Luxembourg, Guillaume Alexandre (April 22, 1852 - February 25, 1912) was the eldest child of Grand Duke Adolf of Luxembourg. ...

• William IV "The Rich", a German nobleman

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