Princess Maria Theresa of Löwenstein-Wertheim-Rosenberg (German: Maria Theresa, Prinzessin von Löwenstein-Wertheim-Rosenberg) (4 January 1870, Rome, Papal States – 17 January 1935, Vienna, Federal State of Austria) was a Princess of Löwenstein-Wertheim-Rosenberg and a member of the House of Löwenstein-Wertheim-Rosenberg by birth and an Infanta of Portugal, Duchess consort of Braganza, and titular queen consort of Portugal through her marriage to Miguel Januário, Duke of Braganza, Miguelist claimant to the throne of Portugal from 1866 to 1920.

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Princess Maria Theresa
Duchess of Braganza (Miguelist)
Born	(1870-01-04)4 January 1870 Rome, Papal States
Died	17 January 1935(1935-01-17) (aged 65) Vienna, Austria
Spouse	Miguel Januário, Duke of Braganza ​ ​ (m. 1893; died 1927)​
Issue	Isabel Maria, Princess of Thurn and Taxis Princess Maria Benedita Princess Mafalda Maria Ana, Princess Karl August of Thurn and Taxis Princess Maria Antónia, Mrs. Chanler Princess Filipa Prince Duarte Nuno, Duke of Braganza Princess Maria Adelaide, Mrs. van Uden
House	Löwenstein-Wertheim-Rosenberg
Father	Charles, Prince of Löwenstein
Mother	Princess Sophie of Liechtenstein

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Maria Theresa was the fifth child and fourth daughter of Charles, Prince of Löwenstein, brother of titular queen consort of Portugal Adelaide of Löwenstein, and his wife Princess Sophie of Liechtenstein. Maria Theresa was an elder sister of Aloys, Prince of Löwenstein.

Maria Theresa married her first cousin Miguel Januário, Duke of Braganza, only son and second eldest child of former King Miguel of Portugal and his wife Adelaide of Löwenstein, on 8 November 1893 in Kleinheubach, Kingdom of Bavaria. Maria Theresa and Miguel had eight children:

• Dona Isabel Maria de Bragança (1894–1970), married Franz Joseph, 9th Prince of Thurn and Taxis and had issue
• Dona Maria Benedita de Bragança (1896–1971), died unmarried and without issue
• Dona Mafalda de Bragança (1898–1918), died unmarried and without issue
• Dona Maria Ana of Braganza (1899–1971), married Karl August, 10th Prince of Thurn and Taxis and had issue
• Dona Maria Antónia of Braganza (1903–1973), married Sidney Ashley Chanler (son of William Astor Chanler) and had issue
• Dona Filipa de Bragança (1905–1990), died unmarried and without issue
• Dom Duarte Nuno, Duke of Braganza (1907–1976), married Dona Maria Francisca of Orléans and Braganza and had issue
• Dona Maria Adelaide de Bragança (1912–2012), married Nicolaas van Uden and had issue