| | List of monarchs who lost their thrones or abdicated in the 20th century |
 | | The following monarchs either lost their thrones through deposition by a coup d'état, by a referendum which abolished their throne, or chose to abdicate during the 20th century. |
 | | King Frederick Augustus III - deposed at the end of the First World war in 1918 with all the other German monarchs. |
 | | Prince William of Wied fled in 1914, following the outbreak of the First World War (d.1945) |
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