List of non-sovereign monarchs who lost their thrones in the 20th and 21st centuries
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The following non-sovereign 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 or 21st century. A list of surviving former monarchs appears at the end of the article.
- Sultan Kehalarat Deelat Nyang Meuha Meulia Paduka Seri Baginda Sultan Berdaulat Zilulahil Filalam Alaudin Muhammad Daud Shah (His Majesty Sultan Muhammad Daud Shah) of Aceh (in Indonesia) surrendered to the Netherlands following the arrest of the Queen and Queen Mother in 1903.
- Grand Duke Frederick II abdicated in 1918.
- Farzand-i-Khas-i-Daulat-i-Inglishia, Shrimant Maharaja Sir Pratapsinhrao Gaekwad, Sena Khas Khel Shamsher Bahadur, Maharaja of Baroda, deposed 1951.
- Maharaja Shri Brijendra Sawai Brijendra Singhji Bahadur Bahadur Jang, Maharaja of Bharatpur was deposed in 1971.
- Sikander Saulat, Iftikhar ul-Mulk, Nawab Sultan Kaikhusrau Jahan Begum Sahiba, Nawab Begum of Bhopal, abdicated in 1926.
- King Charles III (Emperor Charles I of Austria) was deposed in 1918.
- La Pawowoni Karaeng Segeri Arumpone of Bone was deposed in 1905.
- Haji Andi La Mappanjuki Karaeng Silayar Sri Sultan Ibrahim ibnu Sultan Husain Arumpone of Bone abdicated 1946, was restored 1950, and reigned again until 1960.
- Andi Pabenteng Arumpone of Bone was deposed in 1950.
- Duke Ernest Augustus abdicated in 1918.
- Warren Thunder, chief of Buffalo Point, deposed 1969, died 1973.
- William Wilberforce Kadhumbula Nadiope III, omukama of Bugabula, deposed by the Ugandan government in 1967, died 1973
- Major-General H.H. Edward Frederick William David Walugembe Mutebi Luwangula Mutesa II Kabaka of Buganda was deposed by the abolition of the Ugandian kingdoms on September 8, 1967.
- Ndagara, Omukama of Buhweju, deposed 1901.
- Sri Ratu Anak Agung g Nyoman Panji Tisna Raja of Buleleng abdicated 1947 and was reinstalled in 1950.
- Sri Ratu Anak Agung Panji Sakti II Raja of Buleleng abdicated in 1950.
- Emir Mohammed Alim Khan was deposed in 1920 when his lands were taken over by Bolsheviks.
- William Wilberforce Kadhumbula Nadiope III, Isebantu Kyabazinga of Busoga, deposed by the Ugandan Government in 1967.
- Caliph Abdul Mejid II, cousin of the last Ottoman Sultan, was deposed in 1924.
- Bua Laphan Ratsadany, prince of Champasak 1900–1904, was deposed when the principality was abolished on November 22, 1904.
- Violet Pachanos, chief of Chisabibi 1989–1995, deposed or abdicated 1995, restored 1999, reigned until 2001.
- Duke-elect (and German Emperor) William II was deposed following the end of World War I in 1918.
- Sir Sri Rajarshi Rama Varma, Maharaja of Cochin, abdicated his throne in 1914 owing to ill-health and differences with British Empire.
- Rama Varma Parikshith Thampuran, Maharaja of Cochin, signed the instrument of accession to the Dominion of India thus ending the executive political role. Cochin was merged with Travancore to form Travancore-Cochin Union from 1 July 1949.
- Kshatriya Kulavatana Sena Sapta Sahasri Senapati Pratinidhi, Meherban Shrimant Maharaja Sir Vikramsinhrao Tukojirao (Nana Sahib) Puar, Maharaja of Dewas, abdicated in 1947.
- Negus Tekle Haymanot Tessema of Gojjam, died in 1901 and his kingdom was divided and incorporated into the Empire of Ethiopia.
- Andi Ijo Daeng Mattawang Karaeng Lalolang Paduka Sri Sultan Muhammad 'Abdu'l Kadir Aid ud-din ibnu Sultan Muhammad Tahir Muhib ud-din, Sultan of Gowa, was deposed by the Indonesian republic in 1960.
Hesse and by Rhine
- Grand Duke Ernest Louis was deposed in 1918.
- King Ali of Hejaz, deposed by Saudi Military forces in 1925.
- Musinga, Omukama of Igara, deposed 1901.
- The last King of Jimma, Abba Jifar II, died and, on 12 May 1932, the Kingdom of Jimma was incorporated into the Empire of Ethiopia.
- Khan Abd Allah Khan was deposed 1920; his lands were taken over by Bolsheviks.
- Yang Guo Zhen Hkun Lu Kwan, Heng of Kokang—1919
- Sao Edward Yang Kyein Tsai, Saopha of Kokang, deposed by Burma, 1959.
- Sharif 'Abbas ibni al-Marhum Sharif Hasan 'Ali al-Idrus, Yang di-Pertuan Besar of Kubu, was deposed in 1911.
- Sharif Muhammad Zainal Idrus ibni al-Marhum Sharif Ismail al-Idrus, Tuan Besar of Kubu, abdicated in 1921.
- Sharif Salih ibni al-Marhum Idrus al-Idrus, Tuan Besar of Kubu, was deposed by the Japanese in 1943.
- Sharif Hasan ibni al-Marhum Sharif Muhammad Zainal Idrus al-Idrus, Tuan Besar of Kubu, was deposed by the Indonesian
- Raja Don Ote Nicolaas Isu Nisnoni, Raja of Kupang, abdicated in 1945.
- Raja Don Obe Alfonsus Nisnoni, Raja of Kupang, was deposed by the Indonesian republic in 1960.
- Sri Paduka Sultan Aji Muhammad Parikesit al-Adil Khalifat ul-Muminin, Sultan of Kutai Karta Negara, was deposed by the Indonesian government in 1960.
Lamjung and Kaski
- Sri Sri Sri Maharaja Juddha Shamsher Jang Bahadur Rana, Maharaja of Lamjung and Kaski 1932–1945, abdicated on November 29, 1945.
- Sri Sri Sri Maharaja Padma Shamsher Jang Bahadur Rana, Maharaja of Lamjung and Kaski 1945–1948, abdicated in 1948.
- Sri Sri Sri Maharaja Mohan Shamsher Jung Bahadur Rana, Maharaja of Lamjung and Kaski 1948–1951, was deprived of all the hereditary offices and privileges conferred on Jung Bahadur in 1857 on February 18, 1951.
- Paduka Sri Sultan 'Abdu'l-Rahman II Mu'azzam Shah ibni al-Marhum Raja Muhammad Yusuf al-Mahdi, Sultan and Yang di-Pertuan Besar of Lingga, Riau, was deposed in absentia in 1911.
- Prince Leopold IV was deposed in 1918.
- See under Mustang
- Sherif Hussein ibn Ali, was the Sherif of Mecca, and Emir of Mecca from 1908 until 1917. He was deposed by Ibn Saud in 1924.
- Grand Duke Friedrich Franz IV was deposed in 1918.
- The last Grand Duke, Adolf Friedrich VI, committed suicide in February 1918. From then until the abolition of the monarchy in 1918, the Grand Duke of Mecklenburg-Schwerin acted as regent.
- Shaikh Khaz'al Khan ibn Haji Jabir Khan Sardar-i-Aqdas, Shaikh of Mohammerah 1897-1924. Deposed 1924 by Reza Shah, died 1936.
- King Jigme Dorje Palbar Bista of Mustang (or Lo) was deposed in 2008, along with all the other Nepalese monarchs.
- Grand Duke Frederick Augustus was deposed in 1918.
Reuss Elder Line
- Prince Henry XXIV was deposed in 1918.
Reuss Younger Line
- Prince Henry XXVII was deposed in 1918.
- Tamaeva V, Queen of Rimatara, deposed 1901.
- Makobore, omukama of Rujumbura, deposed 1901.
- Epatiana Teuruari'i IV, King of Rurutu, deposed 1900.
- Duke Ernst II was deposed at the end of the First World War in 1918 with all the other German monarchs.
Saxe-Coburg and Gotha
- Duke Charles Edward was deposed at the end of the First World War in 1918 with all the other German monarchs.
- Duke Bernhard III was deposed at the end of the First World War in 1918 with all the other German monarchs.
- Grand Duke William Ernest was deposed at the end of the First World War in 1918 with all the other German monarchs.
- King Frederick Augustus III was deposed at the end of the First World War in 1918 with all the other German monarchs.
- Prince Adolf II was deposed at the end of the First World War in 1918 with all the other German monarchs.
- Prince Günther was deposed at the end of the First World War in 1918 with all the other German monarchs.
- From 1909 Prince Günther of Schwarzburg-Rudolstadt was also ruler of Schwarzburg-Sondershausen, and, as said above, was deposed at the end of the First World War in 1918 with all the other German monarchs.
- Paduka Sri Sultan Tuanku Sulaiman Sharif ul-'Alam Shah ibni al-Marhum Sultan Bashar un-din [Al-Marhum Perbaungan], Sultan and Yang di-Pertuan Besar of Serdang, was deposed in 1946.
- Sri Paduka Tuanku Haji Gusti Adi 'Abdu'l-Majid ibni al-Marhum Panembahan Ismail, Panembahan Kusuma Negara III, Panembahan of Sintang, deposed by Netherlands East Indies authorities in 1913.
- Rukirabasaija Patrick David Matthew Koboyo Olimi III was deposed by the abolition of the Ugandian kingdoms on September 8, 1967.
- Maharaja Raja Ramaraja Sri Patmanabha Dasa Vanchi Pala Bala Rama Varma II (Sri Chithira Tirunal), Kulasekhara Kiritapati Manney Sultan Bahadur, Shamsher Jang, Maharaja of Travancore, signed the instrument of accession to the Dominion of India, 15 August 1947, ending the executive political role of his monarchy. Merged his state with Cochin and served as Rajpramukh of the Travancore-Cochin Union from 1 July 1949 until 31 October 1956. Deprived of his princely rank, titles and honours by the republican federal government of India on 28 December 1971.
- HRH Sarmad i Raja-e-Hindustan, mirza raja, Padma murasa, Sata Vigraha Samrat, maharaja dhiraj, Maharana Sir Sawai Jagdish Singh Kachwaha of Vallabpur. The state merged into the Indian union in 1947. Deprived of his princely rank, titles and honours by the republican federal government of India on 28 December 1971.
- Haji Andi Mangkona Datu Marioriwawo, Aru Matowa of Wajo, abdicated 1949.
- Prince Friedrich was deposed in 1918.
- King William II was deposed in 1918.