Last modified: 31 December 2021
Deaths in reigning and non-reigning royal houses of the year 2012.
* = New
| Date | Name | Age | Place |
| 2 January | Countess Carolin zu Stolberg-Wernigerode | 49 | |
| 7 January | Sheikha Amina bint Rashid bin Ahmed Al Mualla of Umm al Qaiwain (UAE) | ||
| 12 January | Maharani Shiv Kumari of Kotah née Princess of Bikaner (India) | 95 | |
| 13 January | Countess Stefanie zu Königsegg-Aulendorf née Freiin von Waldbott und Bassenheim | 82 | |
| 16 January | Michel Stiepen (Looz Corswarem) | 81 | Henri-Chapelle, Belgium |
| 20 January | Sheikh Humaid bin Mohammad bin Saqer Al-Qasimi of Sharjah (UAE) | ||
| 21 January | Sheikh Saud Nasser Al-Saud Al-Sabah of Kuwait | ||
| 21 January | Marie-Elisabeth Costinescu-Tataranu née Freiin von Strachwitz (Stolberg-Stolberg) | 84 | Absam, Austria |
| 26 January | Hereditary Grand Duchess Karin von Mecklenburg-Schwerin née von Schaper | 91 | Glücksburg, Germany |
| 31 January | Count Ernst Leonhard von Harrach | 91 | Bruck an der Leitha, Austria |
| 31 January | Brigitta von Kalckreuth née Princess zu Stolberg-Rossla | 86 | |
| 13 February | Archduke Franz Salvator of Austria (Tuscany) | 84 | |
| 16 February | Princess Norodom Daravadey of Cambodia | 71 | Montfermeil, Seine-Saint-Denis, France |
| 24 February | Infanta Dona Maria Adelaide de Bragança (Portugal) | 100 | Caparica, Portugal |
| 13 March | Princess Maria Anna of Saxony | 82 | |
| 16 March | Prince Alexander von und zu Liechtenstein | 82 | Villach, Austria |
| 18 March | King George Tupou V of Tonga | 63 | Hong Kong |
| 24 March | Princess Farah Kerimee of Egypt | 87 | |
| 26 March | Kurt Brubach (Salm-Salm) | 90 | Böllenborn, Germany |
| 30 March | Raja Kechil Sulong of Perak | Kuala Lumpur, Malaysia | |
| 2 April | Princess Fatma Neslisah Osmanoglu Sultan of Turkey | 91 | Istanbul, Turkey |
| 26 April | Maria Teresa Caccia Dominioni née Crespi (Fugger von Babenhausen) | 89 | Milan, Italy (?) |
| 2 May | Emanuela de Dampierre (Spain) | 98 | Rome, Italy |
| 5 May | Fürstin Delia zu Oettingen-Oettingen und Oettingen-Wallerstein née Schenk Countess von Stauffenberg | 93 | |
| 10 May | Maharaja Ranjitsinh Gaewad of Baroda (India) | 74 | Vadodara, India |
| 14 May | Countess Léopold de Lannoy née Princess Florence de Croÿ et de Solre | 84 | |
| 15 May | Countess Elisabeth von Platen Hallermund | 13 days | |
| 23 May | Prince Franz von Sachsen-Altenburg | 77 | |
| 6 June | Prince Tomohito of Mikasa of Japan | 66 | |
| 9 June | Countess Marie-Elisabeth zu Stolberg-Stolberg | 93 | Vanves, Hauts-de-Seine, France |
| 16 June | Crown Prince Nayef bin Abdul Aziz al-Saud of Saudi Arabia | 77 or 78 | Geneva, Switzerland |
| 20 June | Fürst Heinrich IV Reuss | 92 | Ernstbrunn, Austria |
| 8 July | Prince Mohammed bin Saud bin Abdul-Aziz of Saudi Arabia | 78 | |
| 10 July | Valli Spencer Moore née Knust (Russia) | 82 | The Old Vicerage, Leigh, Dorset, UK |
| 21 July | Takamasa Ikeda (Japan) | 84 | Kurashiki, Japan |
| 23 July | Margrave Maria Emanuel von Meissen (Saxony) | 86 | La Tour-de-Peilz, Switzerland |
| 13 August | Otto Vogl (Reuss) | 80 | |
| 16 August | Lalla Amina of Morocco | 57 | |
| 27 August | Donna Martha della Torre e Tasso (Thurn und Taxis) née Singer | 68 | USA |
| 14 September | Count Jan Bosco von Sternberg (Lobkowicz) | 75 | Klatovy, Czechia |
| 16 September | Princess Ragnhild, Mrs Lorentzen (Norway) | 82 | Rio de Janeiro, Brazil |
| 3 October | Princess Marina Editha Theresia von Thurn und Taxis | 46 | |
| 6 October | Prince Albert of Saxony | 77 | München, Germany |
| 8 October | Countess Elisabeth von Stillfried und Rattonitz née Countess zu Stolberg-Wernigerode | 89 | Lindau, Germany |
| 14 October | Sheikh Jamal Bin Salem Bin Mohammed Al Qasimi of Ras Al Khaimah (UAE) | ||
| 15 October | Norodom Sihanouk King-Father of Cambodia | 89 | Beijing, China |
| 17 October | Sheikh Saqr bin Khalid Al Qasimi of Sharjah (UAE) | Ajman, UAE | |
| 20 October | Count Johannes von und zu Trauttmansdorff-Weinsberg | 83 | Vienna, Austria |
| 29 October | Prince Abdullah Bin Abdul Aziz Bin Saud Bin Jalawi of Saudi Arabia | 78 | |
| 31 October | Sophie de Figueroa née Princess zur Lippe-Weissenfeld | 90 | Neidling, Austria |
| 17 November | Rosa Sophie Reichsfreifrau von und zu Guttenberg née Princess and Duchess von Arenberg | 89 | |
| * 17 November | Gunhild Knye née Countess von Bentheim-Tecklenburg-Rheda | 90 | Windhoek, Namibia |
| 24 November | Princess Susanne zu Salm-Horstmar née Jantsch | 90 | Angermund, Germany |
| 9 December | Princess Marie-Claire zu Hohenlohe-Bartenstein née Buet de Villars | 96 | Bonn, Germany |
| 17 December | Countess Ursula zu Sayn-Wittgenstein-Berleburg née von Hase | 99 | |
| 26 December | Hans Wolfram Freiherr von Werthern (Castell-Castell) | 87 | |
| 26 December | Count Otto von Waldburg zu Wolfegg und Waldsee |