Ambrósio Fernandes Brandão (c. 1555 — unknown) was a Portuguese planter and writer, who lived in Brazil in the 16th and 17th centuries. He left a book, the Dialogues of the Greatness of Brazil, about his time in Brazil. It is known that was in Brazil by 1583, and was there until at least 1618, and that he was accused of practicing Judaism, but other details about his life are not readily available.