Last modified: 31 December 2021
Deaths in reigning and non-reigning royal houses of the year 2020.
* = New
| Date | Name | Age | Place |
| 6 January | Count Michel Didisheim (Trauttmansdorff-Weinsberg) | 89 | Forest, Belgium |
| 8 January | Infanta Pilar of Spain, Duchess of Badajoz | 83 | Clínica Ruber Internacional, Madrid, Spain |
| 10 January | Qaboos bin Said al Said, Sultan of Oman | 79 | |
| 21 January | Prince Bandar bin Mohammed bin Abdulrahman bin Faisal Al Saud of Saudi Arabia | 95 | |
| 29 January | Princess Monika zu Ysenburg und Büdingen née Baroness von Plessen | 80 | |
| January | Herwart Neuhaus (Ysenburg) | 85 | |
| * 3 February | Archduke Leo of Austria | 91 | |
| 8 February | Princess Yi Haewŏn of Korea | 100 | |
| 13 February (accident) | Cristina de Borbón y Hardenberg (Spain) | 44 | Puerta de Hierro Hospital, Madrid, Spain |
| 15 February | Count Felix von Orsini und Rosenberg | 90 | |
| 20 February | Princess Christa Irene zur Lippe née von Arnim | 96 | |
| 23 February | Count Bernard de Looz Corswarem | 73 | |
| * 24 February | Prince Dominik Lobkowicz | 89 | Knox Center, Rockland, Maine, USA |
| 24 February | Eduard Weig (Castell-Castell) | 67 | |
| 26 February | Prince Talal bin Saud bin Abdulaziz Al Saud of Saudi Arabia | ||
| 2 March | Sheikh Ahmed bin Mohammad bin Salman Al Khalifa of Bahrain | ||
| 5 March | Prince Max Emanuel von Thurn und Taxis | 84 | |
| 10 March | Prince Abdulaziz bin Abdullah bin Faisal bin Farhan Al Saud of Saudi Arabia | ||
| 14 March | Maria Anna Teresia Laurentia Wildschut-von Schwarzenberg | 94 or 95 | |
| 14 March | Countess Beatrice von Hardenberg (Spain) | 72 | Hospital Quirón de Marbella, Spain |
| 17 March | María de las Mercedes de Zornoza y Ponce de León (Georgia) | 77 | Villafranca del Castillo, Madrid, Spain |
| 24 March | Raimondo Principe Orsini d’Aragona (Georgia) | 89 | Rome, Italy |
| 24 March | Prapapan Kornkosiyakaj née Princess Prapapan Bhanubandhu (Thailand) | 90 | Chulabhorn Hospital, Thailand |
| 26 March (covid-19) | Princess Marie-Thérèse de Bourbon de Parme | 86 | Paris, France |
| 26 / 27 March | Prince Nikolaus zu Bentheim-Tecklenburg | 95 | Schloss Rheda, Germany / Herzebrock-Clarholz, Germany |
| 9 April | The mother of Prince Abd al-Rahman bin Sa’d II bin Abd al-Rahman of Saudi Arabia | ||
| 14 April | Freiherr Friedrich Mayr von Melnhof (Orsini und Rosenberg) | 95 | Glanegg Castle, Grödig, Austria |
| 15 April | Princess Diane de Croÿ | 93 | Avesnes-sur-Helpe, Nord, France |
| 16 April | Prince Georg Friedrich zu Waldeck und Pyrmont | 83 | |
| 19 April | Fürstin Hildegard zu Stolberg-Roßla née Sauerbier | 97 | MathildenHospital, Büdingen, Germany |
| 29 April | 80th Prince and Grand Master Fra’ Giacomo Dalla Torre del Tempio di Sanguinetto (Order of Malta) | 75 | Rome, Italy |
| 4 May | Princess Diana Marguerite de Bourbon-Parme | 87 | Bad Krozingen, Germany |
| 6 May | Essawi Khadr (Albania) | ||
| 6 May | José Pedro Sebastián de Erice y Gómez-Acebo (Schönborn-Buchheim) | 77 | |
| 9 May | Princess Badiya Bint Ali of Iraq | 99 | London, Great Britain |
| 14 May | Prince Phinda Dlamini of Swaziland | 72/73 | MediSun Clinic, Ezuwlini, Swaziland |
| 14 May | Princess María Inmaculada of Bourbon-Two Sicilies | 82 | Mallorca, Spain |
| 17 May (motorcycle accident) | Otto Prinz und Landgraf von Hessen | 55 | BAB A96 between Wangen-West and Weißensberg, Germany |
| 18 May | Friedrich-Alexander Hoppe (Castell-Rüdenhausen) | 52 | |
| 31 May | Bernd Rosemeyer (Castell-Rüdenhausen) | 82 | |
| 1 June | Princess Elisabeth zu Sayn-Wittgenstein-Hohenstein geb. Freiin von Zedlitz und Leipe | 83 | Hof Breitenbach, Bad Laasphe, Germany |
| 4 June | Prince Saud bin Abdullah bin Faisal bin Abdulaziz Al Saud of Saudi Arabia | ||
| 10 June | Baroness Elizabeth-Ann de Massy (Monaco) | 72 | Centre Hospitalier Princesse Grace, Monte-Carlo, Monaco |
| 11 June | Princess Nalini Rajya Laxmi Devi Singh of Nepal, Rajmata of Poonch | 95 | New Delhi, India |
| 26 June | Teresa de Orleans e Bragança née de Cesar Leite (Brazil) | 91 | Rio de Janeiro, Brazil |
| 28 June | Prince Bandar bin Saad bin Mohammad bin Abdulaziz bin Saud bin Faisal Al Saud of Saudi Arabia | ||
| * 5 July | Prince Edward Abnel Keli’iahonui Kawananakoa (Hawaii) | 71 | Marina del Rey, CA, USA |
| 6 July (covid-19) | Count Johannes von Mirbach-Geldern-Egmont, Prince zu Hohenlohe-Jagstberg | 80 | |
| 7 July | Prince Khalid bin Saud bin Abdulaziz Al Saud of Saudi Arabia | Abroad | |
| 8 July (Covid-19) | AmaRharhabe Queen Noloyiso Sandile (Zulu, South Africa) | 56 | Cecilia Makiwane Hospital, Mdantsane township of East London, Eastern Cape, South Africa |
| 9 July | Sheikh Ahmed bin Sultan Al Qasimi, Deputy Ruler of Sharjah (UAE) | 71/72 | London, Great Britain |
| 12 July | Princess Bharati Rajya Laxmi Devi Shah of Nepal, Rajmata of Mayurbhanj | 93 | Belgadia Palace, India |
| * 15 July | Louisa B. Lobkowicz Mead née Princess Lobkowicz | 61 | Waterville, Maine, USA |
| * 16 July | Count Paul von Degenfeld-Schonburg (Salm-Salm) | 96 | München, Germany |
| 18 July | Sheikh Nasser Al-Humoud Al-Jaber Al-Sabah of Kuwait | 89 | |
| 22 July | Sultan Sepuh XIV of Kasepuhan | 54 | |
| 23 July (burial) | Princess Madawi bint Abdullah bin Muhammad Ibn Jalawi Al Saud of Saudi Arabia | ||
| 25 July | Prince Sisowath Samyl Monipong of Cambodia | 79 | |
| 27 July (burial) | The mother of Prince Faisal bin Abdullah bin Nasser bin Abdulaziz Al Saud of Saudi Arabia | ||
| 2 August (covid-19) | Prince Tshekedi Dlamini of Swaziland | Private clinic, Swaziland | |
| 11 August | Prince Waldemar zu Schaumburg-Lippe | 79 | Los Angeles, CA, USA |
| 13 August | Príncipe Dom Eudes de Orleans e Bragança (Brazil) | 81 | Rio de Janeiro, Brazil |
| 16 August (covid-19) | Princess Ngabisa Dlamini of Swaziland | Lubombo Referal Hospital, Swaziland | |
| 20 August | Hon. Desmond Guinness (Urach, Württemberg) | 88 | |
| 1 September | Count Friedrich von und zu Trauttmansdorff-Weinsberg “Fritz” | 94 | St. Catharines General Hospital, Ontario, Canada |
| 8 September | Countess Maria Immaculata zu Toerring-Jettenbach née Freiin Waldbott von Bassenheim | 99 | Dunzelbach, Germany |
| 12 September | Count Josef Hubert von Neipperg | 102 | Schwaigern, Germany |
| 12 September | Count Franz zu Stolberg-Stolberg | 84 | Moncalieri, Italy |
| 16 September | Helmut Brand (Königsegg-Aulendorf) | 88 | |
| 18 September | Princess Zuriashwork Gebre-Igziabiher (Ethiopia) | 89 | |
| 20 September | Tengku Abdul Aziz Tengku Mohd Hamzah (Kelantan, Malaysia) | 87 | Gleneagles Hospital, Kuala Lumpur, Malaysia |
| 24 September | Prince Albrecht von Croÿ | 82 | |
| 27 September | Countess Clarissa von Waldburg zu Zeil und Trauchburg, Gräfin von Schönborn-Wiesentheid | 83 | |
| 29 September | Emir of Kuwait | 91 | Mayo Clinic, Rochester, Minnesota, USA |
| 15 October | Thomas Bagusat (Fürstenberg) | 79 | |
| 15 October | Tengku Merjan Almarhum Sultan Yahya Petra of Kelantan (Malaysia) | Raja Perempuan Zainab II Hospital, Kota Baru, Kelantan, Malaysia | |
| 20 October (burial) | Prince Nawaf bin Saad bin Saud bin Abdulaziz Al-Saud of Saudi Arabia | Riyadh, Saudi Arabia | |
| 24 October | Prince Haji Abdul Azim of Brunei Darussalam | 38 | |
| 25 October | Count Andreas zu Stolberg-Stolberg | 66 | Salzburg, Austria |
| 1 November | Count Ulrich Grote (Sayn-Wittgenstein-Berleburg) | 80 | |
| 2 November | Sárolta Wutholen (Austria) | 80 | |
| 3 November | Duke Ferdinand von Württemberg | 95 | |
| 5 November | Sheikha Maryam Bint Hamdan Bin Zayed Bin Khalifa Al Nahyan of Abu Dhabi | Al Ain City, Abu Dhabi, UAE | |
| 6 November | Prince Lethukuthula Zulu | 50 | Northwold, Johannesburg, South Africa |
| 7 November | Maria Oktavia Bartels née Countess von Schönburg-Glauchau | 90 | Meisenheim, Germany |
| 10 November | Maryse Bokassa née Dimassi (Central African Empire) | Bangui, Central African Republic | |
| 11 November | Prince Khalifa bin Salman al Khalifa of Bahrain | 84 | Mayo Clinic, Rochford, Minnesota, USA |
| 12 November | Princess Maria Annunciata von Isenburg | 79 | |
| 24 November | Countess Freude-Maria von Rechberg und Rothenlöwen née Freifrau Varnbüler von und zu Hemmingen | 89 | |
| 26 November (Covid-19) | Johannes Fürst von Khevenhüller-Metsch “Hans” | 64 | Rome, Italy |
| 26 November | Princess Ilke zu Wied née Fischer | 83 | |
| * 30 November | Princess Elisabeth zu Salm-Salm | 98 | Köln, Germany |
| 2 December | Count Johannes zu Königsegg-Aulendorf | 95 | Schloss Königseggwald, Germany |
| 2 December (Covid-19) | Valéry Giscard d’Estaing, former president of France, former Co-Prince of Andorra | 94 | Loir-et-Cher, France |
| 3 December (burial) | Princess Hessa(h) bint Faisal bin Abdulaziz Al Saud of Saudi Arabia | Riyadh, Saudi Arabia | |
| 8 December | Prince Maynolf zu Erbach-Schönberg | 84 | |
| 13 December | Princess Eva Maria of Serbia née Andjelkovic | 94 | Palm Springs, Florida, USA |
| 18 December | Sheikh Abdullah bin Hamad bin Abdullah Al Sharqi of Fujairah (UAE) | ||
| 20 December | Sheikh Nasser Al Sabah Al Ahmad Al Sabah of Kuwait | 72 | |
| 22 December | Count Albert Fugger von Glött, Count von Kirchberg und zu Weissenhorn né Count von und zu Arco-Zinneberg | 88 | Mindelheim, Germany |
| 25 December (burial) | The mother of Prince Mit’ab bin Abdallah bin Abd al-Aziz of Saudi Arabia | ||
| 28 December | Maharawal Brij Raj Singh of Jaisalmer (India) | 52 | Medanta hospital, Gurugram, India |
| December | Maria Assunta Gräfin von Oppersdorff née Countess von Schönburg-Glauchau “Sissi” | 85 | |
| Exact date unknown | Countess Birgit von Waldburg zu Wolfegg und Waldsee | 78 |