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 21st century. A list of surviving former monarchs appears at the end of the article.

See also: Abolished monarchy, List of current monarchs, List of non-sovereign monarchs who lost their thrones

• List of monarchs who abdicated
• List of monarchs who lost their thrones in the 20th century
• List of monarchs who lost their thrones in the 19th century
• List of monarchs who lost their thrones in the 18th century
• List of monarchs who lost their thrones in the 17th century
• List of monarchs who lost their thrones in the 16th century
• List of monarchs who lost their thrones in the 15th century
• List of monarchs who lost their thrones in the 14th century
• List of monarchs who lost their thrones in the 13th century
• List of monarchs who lost their thrones before the 13th century