| Beatrice of Portugal | |
| Succession: | Duchess consort of Savoy |
| Reign-Type: | Tenure |
| Reign: | 29 September 1521 – |
| Succession1: | Countess of Asti |
| Reign1: | 3 April 1531 – 8 January 1538 |
| Predecessor1: | Charles V |
| Successor1: | Emmanuel Philibert |
| Spouse: | Charles III, Duke of Savoy |
| Issue: | Emmanuel Philibert, Duke of Savoy |
| House: | Aviz (by birth) Savoy (by marriage) |
| Father: | Manuel I of Portugal |
| Mother: | Maria of Aragon |
| Birth Date: | 31 December 1504 |
| Birth Place: | Lisbon, Portugal |
| Death Date: | 8 January 1538 (aged 33) |
| Death Place: | Nice, Savoy |
Infanta Beatrice of Portugal (pronounced as /pt/; 31 December 1504 – 8 January 1538) was a Portuguese princess by birth and Duchess of Savoy by marriage to Charles III, Duke of Savoy. She was the ruling countess of Asti from 1531 to 1538.
She was the second daughter of Manuel I of Portugal (1469–1521) and his second wife, Maria of Aragon (1482–1517). Her siblings included King John III of Portugal and Isabella, Holy Roman Empress. She was educated under the supervision of her governess Elvira de Mendoza.
In Villefranche-sur-Mer on 29 September 1521, Beatrice married Duke Charles III of Savoy. He had succeeded as the duke of Savoy in 1504, making Beatrice duchess at the moment of her wedding.
Beatrice is described as beautiful, brilliant, and ambitious. In 1531, she received as a fiefdom, from her cousin and brother-in-law, Emperor Charles V, the County of Asti which, on her death, was inherited by her son and permanently included on the Savoys' heritage.
In 1534, she welcomed Christina of Denmark, a ward of her brother-in-law the Emperor, on her way to her marriage with the Duke of Milan. When Christina was widowed in 1535, the Milanese Count Stampa suggested a marriage between Christina and the eldest son of Beatrice, Louis, the heir of Savoy, in an attempt to protect Milan from Imperial sovereignty. Beatrice supported the plan, and when Louis died, she suggested that her next son could replace him. Nothing more was heard of this, however. In April 1536, Beatrice fled from the French conquest of Savoy to Christina in Milan in the company of two of her surviving children and the Shroud of Turin from Chambéry. In May, she was able to visit the Emperor with Christina in Pavia, but without any political result. She then lived as a guest with Christina in Milan, with whom she was good friends. In November 1537, Beatrice was escorted by the Imperial viceroy of Milan to the Emperor in Genoa, but again, the meeting was without any result. She continued to Nice, where she reunited with her spouse. She died in Nice in January 1538.
Beatrice and Charles III had nine children:
After the death of the childless Sebastian of Portugal (her grand-nephew), her son fought for his rights to become King of Portugal; however, he failed and the throne was given to Isabella's son Philip.
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