Infanta Maria Teresa of Braganza (Portuguese pronunciation: [mɐˈɾiɐ tɨˈɾezɐ] or [ˈtɾezɐ]; 29 April 1793 – 17 January 1874) was the firstborn child of John VI of Portugal and Carlota Joaquina of Spain.

As the eldest child of the heir apparent, Maria Teresa was granted the title Princess of Beira, which she held until her brother Francisco António was born in 1795.

She was married on 13 May 1810 in Rio de Janeiro (where the royal family was exiled because of the Napoleonic wars) to her cousin Infante Pedro Carlos, Prince of Spain and Portugal.

In the last years of the reign of her uncle Ferdinand VII of Spain (died 1833), Teresa lived in Madrid and plotted to strengthen Don Carlos' position in succession.

On 15 January 1837, the Cortes of Spain legislated her excluded from the Spanish succession, rights belonging to her in descent from her mother, on grounds of her being a rebel along with Don Carlos.