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.
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 in the 20th century
(Tanganyika was later united with Zanzibar, and Tanzania was formed.)
(Zanzibar was later united with Tanganyika, and Tanzania was formed.)