Alessandro Mattei was an Italian Cardinal, and a significant figure in papal diplomacy of the Napoleonic period. He was from the Roman aristocratic House of Mattei.
- Occupation
- Catholic priest, Catholic bishop
- Position held
- Dean of the College of Cardinals, cardinal-bishop, Roman Catholic Archbishop of Ferrara, cardinal-bishop of Ostia
- Citizenship
- Papal States
- Born
- February 20, 1744
- Died
- April 20, 1820
