Infanta Antónia of Portugal was a Portuguese infanta (princess) of the House of Braganza, daughter of Queen Maria II of Portugal and her King consort Ferdinand II of Portugal. Through her father, she also held the titles of Princess of Saxe-Coburg and Gotha and Duchess of Saxony.

Dona Maria II "the Educator" or "the Good Mother", was Queen of Portugal from 1826 to 1828, and again from 1834 to 1853.