Infanta Maria Antónia of Portugal (Portuguese: Maria Antónia Adelaide Camila Carolina Eulália Leopoldina Sofia Inês Francisca de Assis e de Paula Micaela Rafaela Gabriela Gonzaga Gregória Bernardina Benedita Andrea; 28 November 1862 – 14 May 1959) was the seventh and last child of Miguel I of Portugal and Adelaide of Löwenstein.

She was born in exile as the youngest child of her parents in the Grand Duchy of Baden as her father, Infante Miguel, had been banished from Portugal by his brother, Pedro I of Brazil, after usurping and losing the Portuguese throne in the Liberal Wars.

On 15 October 1884 at Schloss Fischorn, Maria Antonia married Robert I, Duke of Parma as his second wife.

By 1940, Zita and her family, Maria Antonia and her daughter Isabella were living in reduced circumstances in Quebec.

[2] Eventually, after World War II's end, Maria Antonia moved to Berg Castle, Luxembourg where she celebrated her 90th birthday.