Isabel Maria of Bragança, Infanta of Portugal (Isabel Maria Alberta Josefa Micaela Gabriela Rafaela Francisca de Paula e de Assis Teresa Adelaide Eulália Sofia Carolina; 19 November 1894, Kleinheubach, Kingdom of Bavaria – 12 January 1970, Regensburg, Bavaria, Germany) was a member of the House of Braganza and Infanta of Portugal by birth.
Through her marriage to Franz Joseph, 9th Prince of Thurn and Taxis, Isabel Maria was also a member of the House of Thurn and Taxis and Princess consort of Thurn and Taxis.