Last modified: 14 March 2021
Deaths in reigning and non-reigning royal houses of the year 2015.
* = New
| Date | Name | Age | Place |
| 1 January | Mrunalini Devi Puar (Dhar & Baroda, India) | 81 | Baroda, India |
| 4 January | Princess Anneliese von Thurn und Taxis née Zerbst “Sonja” | 92 | |
| 12 January | Prince Maximilian von Croÿ | 26 | |
| 21 January | Sachiko Kitashirakawa née Tokugawa (Japan), widow of Prince Nagahisa | 98 | |
| 23 January | King Abdullah of Saudi Arabia | 90 | Riyadh, Saudi Arabia |
| 24 January | Johan Martin Ferner (Norway) | 87 | Oslo University Hospital, Oslo, Norway |
| 24 January | Tengku Ampuan Tua Terengganu, Tengku Intan Zaharah Almarhum Tengku Seri Setia Raja Tengku Hitam Omar, Sultanah of Terengganu, Queen of Malaysia 1965-1970 | 86 | Terengganu, Malaysia |
| 31 January | Reichsfreifrau Marie Adelheid von Freyberg-Eisenberg née Princess von der Leyen und zu Hohengeroldseck | 82 | Haldenwang, Germany |
| 5 February | Countess Astrid zu Solms-Wildenfels née Kohlhauer | 76 | Bad Homburg, Germany |
| 11 February | Princess Susi zu Hohenlohe-Langenburg née Zsigmond | 56 | Peace Health Sacred Heart Medical Center, River Bend, Springfield, Oregon, USA |
| 12 February | Prince Fahd bin Mohammed bin Abdulaziz Al Saud of Saudi Arabia | 84 | |
| * 16 February | Princess Minh Duc of Annam née Paule Renee Bonnaud | 96 | Paris, France |
| 19 February | Sultan Mudaffar Sjah of Ternate | 79 | Pondok Indah Hospital, South Jakarta, Indonesia |
| 20 February | Prince Sisowath Chittara of Cambodia | 55 | Cambodia |
| 22 February | Alexandra Hilz née Princess zu Hohenlohe-Oehringen | 83 | |
| 26 February | Countess Roger de La Rochefoucauld née Princess Isabelle de Bourbon de Parme | 92 | |
| * 5 March | Prince Saudi bin Sultan bin Saud bin Abdallah Al Saud of Saudi Arabia | 42 | Saint-Bon-Tarentaise, Savoie, France |
| 8 March (burial) | Prince Khalid bin Abdallah bin Nasir Al Saud of Saudi Arabia | ||
| 12 March | Fürstin Marie Luise Reuss née Princess zu Salm-Horstmar | 96 | Schloss Ernstbrunn, Austria |
| 12 March | Fürst Carl zu Wied | 53 | Marienhaus Klinikum St. Elisabeth, Neuwied, Germany |
| 25 March | Fürstin Gunilla Fugger von Babenhausen née Countess Bielke | 95 | |
| 2 April | Anthony Brian Allen (Russia) | 84 | Victoria, BC, Canada |
| 7 April | Hassan Al Yaacoubi (Morocco) | ||
| 9 April | Crown Prince Kardam of Bulgaria, Prince of Tirnovo | 52 | Sanchinarro Hospital, Madrid, Spain |
| 9 April (burial) | The mother of Prince Sa’d bin Saud bin Sa’d Al Saud of Saudi Arabia | ||
| 10 April | Jin Youzhi (born as Puren) (China) | 96 | |
| 16 April (burial) | The mother of Prince Faysal bin Abd al-Majid bin Abd al-Aziz Al Saud of Saudi Arabia | ||
| 25 May | Fürstin Rosemarie zu Erbach-Schönberg née Moshage | 87 | Bensheim, Germany |
| 30 May | Alfred Neven DuMont (Auersperg) | 88 | |
| 1 June | Princess Alexandra of Hannover née Princess zu Ysenburg und Büdingen | 77 | |
| * 2 June | Jean Alphonse Bernard (Egypt) | 91 | Paris, France |
| 2 June | The mother of Prince Mish’al bin Saud bin Abd al-Aziz of Saudi Arabia | ||
| 4 June | Princess Monika of Hannover née Countess zu Solms-Laubach | 85 | Laubach, Germany |
| 4 June | Princess Jawahir bint Abd al-Aziz al Saud of Saudi Arabia | ||
| 17 June | Prince Maximilian von Croÿ | 82 | Rakovnik, Czechia |
| 18 June (burial) | Princess Mudhawi bint Mish’al bin Abd al-Aziz Al Saud of Saudi Arabia | ||
| 5 July | Archduchess Dorothea of Austria (Tuscany) née Princess of Bavaria | 95 | St. Gilgen, Austria |
| 5 July (burial) | Prince Abdallah bin Abd al-Aziz bin Musa’id Al Saud of Saudi Arabia | Mecca, Saudi Arabia | |
| * 6 July | Countess Louisa zu Stolberg-Stolberg née von Pachmann | 91 | Silz, Austria |
| 7 July | Prince Ahmad bin Saud bin Abd al-Aziz al-Saud of Saudi Arabia | ||
| 7 July | Countess Anna Alexandra zu Solms-Wildenfels | 89 | Augsburg, Germany |
| 9 July | Princess Irina Bagration-Mukhransky née Countess Tchernychev-Bezobrazov | 88 | New York, USA |
| 9 July | Prince Saud bin Faisal bin Abdulaziz al Saud of Saudi Arabia | 74 or 75 | Los Angeles, California, USA |
| 12 July | Count Theobald Czernin von Chudenitz (Lobkowicz) | 79 | Czechia |
| 14 July | Archduchess Jerrine of Austria née Soper, she used the name Jerrine Habsburg- Lothringen | 84 | Commerce, Michigan, USA |
| 22 July | Princess Eleanor Kawananakoa née Lent (Hawaii) | 70 | |
| 23 July | Princess Ernestine von Auersperg-Breunner | 82 | |
| 26 July | Sheikha Haya Sabah Al-Salem Al-Humoud Al-Sabah of Kuwait | 56 | |
| 27 July | Princess Misha’il bint Abd al-Muhsin bin Abd al-Aziz Al Saud of Saudi Arabia | ||
| 28 July | Fürst Philipp Reinhard zu Solms-Hohensolms-Lich | 80 | Lich, Germany |
| 28 July | Alayeluwa Oba Okunade Sijuwade, Olubuse II, 50th Ooni of Ife (Nigeria) | 85 | London Clinic, 20 Devonshire Place, London, UK |
| 10 August | Count Lukas zu Stolberg-Stolberg | 88 | |
| 12 August | Freifrau Marie-Sophie von Doblhoff-Dier née Princess von Auersperg | 92 | Baden near Vienna, Austria |
| 13 August | Sheikh Isa bin Mohammed bin Abdullah Al-Khalifa of Bahrain | 76 | abroad |
| 20 August | Prince Armin zur Lippe | 91 | Detmold, Germany |
| 22 August | Panayottis Skinas (Parma) | 78 | Athens, Greece |
| 29 August | Princess Nuf bint Abd al-Aziz bin Abd al-Rahman of Saudi Arabia | abroad | |
| 5 September | Duchess Donata von Oldenburg née Countess zu Castell-Rüdenhausen | 65 | Hospital, Traunstein, Germany |
| 15 September | Countess Maria Susana Waldbott und Bassenheim née Castex Lainfor | 89 | |
| 19 September | Sheikh Rashid bin Mohammed Al Maktoum of Dubai (UAE), Crown Prince 2006-2008 | 33 | |
| 19 September | Robert Zellinger de Balkany (Italy) | 84 | |
| 21 September | Tengku Raudzah Sultan Hisamuddin Alam Shah, The Raja Puan Muda of Kedah (Malaysia) | 85 | Sultanah Bahiyah Hospital, Alor Setar, Kedah, Malaysia |
| 23 September | Duchess Alexandra von Croÿ née Miloradovich | 55 | Hospital, Essen, Germany |
| 29 September | Friedrich Wilhelm Prinz von Preussen (Prussia) | 76 | Berlin, Germany |
| 29 September | Prince Nawaf bin Abdulaziz Al Saud of Saudi Arabia | 83 | |
| September | Perizad Söylemezoglu (Turkey) | 97 | |
| 2 October | Count Franz zu Erbach-Erbach | 90 | Erbach, Germany |
| 5 October | Duke of Calabria (Bourbon-Two Sicilies) | 77 | Finca La Toledana, Retuerta del Bullaque (Ciudad Real), Spain |
| * 9 October | Princess Jean de Lobkowicz née Countess Pauline d’Ursel | 89 | Paris, France |
| 16 October | Michael Naylor-Leyland (Hannover) | 59 | |
| 27 October | Enrico Gandolfi (France) | 74 | Laterina, Italy |
| 4 November | Tunku Hamidah Almarhum Sultan Badlishah of Kedah (Malaysia) | 89 or 90 | Sultanah Bahiyah Hospital, Alor Setar, Kedah, Malaysia |
| 4 November | Catharina Countess von Orsini und Rosenberg née Countess Bielke | 84 | |
| 7 November | Sulaimon Adegboyega Alao Omiyale, The Balogun of Ibadanland (Niger) | 91 | University College Hospital, Ibadan, Niger |
| 11 November | Elvira Zogu (Albania) | 83 | |
| 13 November | Elizabeth Silitch née Countess von Colloredo-Mannsfeld | 78 | Braxton County, West Virginia, USA |
| 14 November | Sheikh Isa bin Ali bin Hamad Al-Khalifa of Bahrain | ||
| 16 November (burial) | The mother of Prince Nawwaf bin Faysal bin Saud of Saudi Arabia | ||
| 18 November | Prince Cengiz Nazim Osmanoglu of Turkey | 75 | New Hanover Hospital, Wilmington, North Carolina, USA |
| 20 November | Princess Millena von Leiningen née Manov | 53 | Greenwich Hospital, Greenwich, Connecticut, USA |
| 21 November | Kanjeng Gusti Pangeran Adipati Aryo, Prince Paku Alam IX of Pakualaman (Yogyakarta, Indonesia) | 77 | |
| 22 November | Prince Bandar bin Faisal bin Abdulaziz Al Saud of Saudi Arabia | ||
| 29 November | Tunku Abdul Malik ibni Almarhum Sultan Badlishah, The Raja Muda of Kedah (Malaysia) | 86 | Sultanah Bahiyah Hospital, Alor Setar, Kedah, Malaysia |
| 30 November | Brajraj Kshatriya Birbar Champuti Singh Mohapatra, Maharaja of Tigiria (Orissa, India) | 94 or 97 | |
| 2 December | Fürst Georg von Waldburg zu Zeil und Trauchburg | 87 | Schloss Zeil, Germany |
| 5 December | Tunku Abdul Jalil Iskandar Ibrahim Ismail Ibni Sultan Ibrahim, The Tunku Laksamana of Johor (Malaysia) | 25 | Sultanah Aminah Hospital, Johor Bahru, Johor, Malaysia |
| 8 December | Marie-Anne von Simson née Altgräfin zu Salm-Reifferscheidt-Krautheim und Dyck | 82 | |
| 11 December | Stephanie Christoforetti née Princess zu Windisch-Graetz | 82 | |
| 13 December | Princess Alienor Faye von und zu Liechtenstein | 1 1/2 | USA |
| 29 December (burial) | Prince Saud bin Mohammed bin Abdulaziz Al Saud of Saudi Arabia | Riyadh, Saudi Arabia | |
| Exact date unknown | Amadea Sachs née Princess Reuss | 92 |