Duarte Fernando Álvarez de Toledo Portugal was a Spanish nobleman, soldier, and statesman, Grandee of Spain, 7th Count of Oropesa, 6th Count of Deleytosa, 3rd Marquis of Frechilla and Villarramiel, 3rd Marquis of Jarandilla, knight of the Order of Alcántara, who served as Viceroy of Navarre (1643–1645), of Valencia (1645–1650), of Sardinia, President of the Council of the Military Orders (1663–1669) and of the Council of Italy (1669–1671) and Spanish Ambassador to the Holy See.
- Occupation
- politician
- Position held
- viceroy of Navarra, Viceroy of Valencia, list of presidents of the Council of Italy (Spanish Empire), Viceroy of Sardinia
- Citizenship
- Spain
