| Date of Death | Deceased Cardinals (40) |
| 1800.02.10 | Cardinal-Deacon emeritus of S. Maria in Via Lata (1794.09.12 – 1798.09.07) Camerlengo emeritus of Sacred College of Cardinals (1798.01.29 – 1798.03.12) |
| 1800.04.08 | Cardinal-Priest of S. Pudenziana (1778.03.30 – 1800.04.08) Metropolitan Archbishop of Bologna (Italy) (1777.12.15 – 1800.04.08) |
| 1800.06.27 | Cardinal-Priest of S. Lorenzo in Panisperna (1794.09.12 – 1800.06.27) |
| 1800.09.23 | Metropolitan Archbishop of Rouen (France) ([1759.04.25] 1759.06.02 – 1800.09.23) |
| 1800.10.27 | Cardinal-Priest of S. Maria sopra Minerva (1787.09.28 – 1800.10.27) Archbishop-Bishop of Ancona e Umana (Italy) (1785.02.14 – 1800.10.27) |
| 1801.12.13 | Cardinal-Priest of S. Anastasia (1785.04.11 – 1801.12.13) Bishop of Viterbo (Italy) (1785.02.14 – 1801.12.13) Bishop of Tuscanella (Italy) (1785.02.14 – 1801.12.13) |
| 1801.12.19 | Cardinal-Priest of S. Prassede (1793.06.17 – 1801.12.19) Cardinal-Priest of S. Martino ai Monti in commendum (1793.06.17 – 1801.12.19) Prefect of Sacred Consistorial Congregation (1800? – 1801.12.19) Major Penitentiary of Sacred Apostolic Penitentiary (1788 – 1801.12.19) Librarian of Vatican Apostolic Library (1779.12.15 – 1801.12.19) Archivist of Vatican Secret Archives (1779.12.15 – 1801.12.19) Archpriest of Papal Archbasilica of Saint John Lateran (1781 – 1801.12.19) |
| 1801.12.28 | Cardinal-Deacon of S. Giorgio in Velabro (1794.09.12 – 1801.12.28) Vice-Camerlengo of the Holy Roman Church emeritus of Reverend Apostolic Camera (1789.04.07 – 1794.02.21) |
| 1801.12.31 | Cardinal-Priest of S. Bernardo alle Terme (1783.02.17 – 1801.12.31) Metropolitan Archbishop of Napoli (Italy) (1782.12.16 – 1801.12.31) |
| 1802.04.13 | Cardinal-Priest of S. Prisca (1801.07.20 – 1802.04.13) |
| 1802.07.01 | Cardinal-Priest of S. Silvestro in Capite (1794.02.21 – 1802.07.01) |
| 1802.08.12 | Cardinal-Priest of S. Cecilia (1784.09.20 – 1802.08.12) Prefect of Sacred Congregation of the Index (1800.01? – 1802.08.12) Prefect of Sacred Congregation of the Propagation of the Faith (1795.02.27 – 1802.08.12) |
| 1802.09.29 | Cardinal-Priest of S. Maria della Vittoria (1801.12.23 – 1802.09.29) Commendatory Abbot of Subiaco (Italy) (1801 – 1802.09.29) Prefect of Sacred Congregation of the Index (1802.08.18 – 1802.09.29) |
| 1802.12.07 | Cardinal-Priest of S. Callisto (1800.04.02 – 1802.12.07) |
| 1803.02.05 | Metropolitan Archbishop of Palermo (Italy) (1802.03.29 – 1803.02.05) |
| 1803.02.16 | Bishop emeritus of Strasbourg (France) (1779.03.11 – 1801.11.29) |
| 1803.04.14 | Cardinal-Priest of Ss. Quattro Coronati (1775.04.03 – 1803.04.14) Metropolitan Archbishop of Wien (Austria) (1757.03.23 – 1803.04.14) |
| 1803.08.12 | Cardinal-Priest of S. Maria degli Angeli (1795.12.18 – 1803.08.12) Prefect of Sacred Congregation of Good Government (1800.12.02 – 1803.08.12) |
| 1803.09.06 | |
| 1803.09.15 | Cardinal-Bishop of Ostia–Velletri (1775.12.18 – 1803.09.15) Archpriest of Papal Basilica of Saint Mary Major (1793 – 1803.09.15) |
| 1803.12.17 | Metropolitan Archbishop of Udine (Italy) (1792.09.24 – 1803.12.17) |
| 1804.02.29 | Cardinal-Priest of S. Anastasia (1802.05.24 – 1804.02.29) |
| 1804.04.17 | Cardinal-Priest of Ss. XII Apostoli (1797.07.24 – 1804.04.17) Metropolitan Archbishop emeritus of Toledo (Spain) (1772.01.27 – 1800.12.15) |
| 1804.06.01 | Cardinal-Priest of S. Croce in Gerusalemme (1788.04.07 – 1804.06.01) Bishop of Szombathely (Hungary) (1800.05.12 – 1804.06.01) |
| 1804.06.11 | Metropolitan Archbishop emeritus of Mechelen (Belgium) (1759.05.28 – 1802.04.18) |
| 1804.08.22 | Metropolitan Archbishop of Tours (France) ([1802.04.09] 1802.04.16 – 1804.08.22) |
| 1804.11.23 | Cardinal-Priest of S. Clemente (1789.08.03 – 1804.11.23) Prefect of Sacred Congregation of the Propagation of the Faith (1802.08.16 – 1804.11.23) |
| 1805.11.05 | Cardinal-Bishop of Sabina (1800.04.02 – 1805.11.05) Archbishop-Bishop of Ascoli Piceno (Italy) (1795.06.01 – 1805.11.05) |
| 1806.04.14 | |
| 1807.07.05 | Metropolitan Archbishop of Cagliari (Italy) (1798.01.29 – 1807.07.05) |
| 1807.07.13 | Cardinal-Bishop of Ostia–Velletri (1803.09.26 – 1807.07.13) Cardinal-Priest of S. Lorenzo in Damaso in commendum (1763.01.14 – 1807.07.13) Vice-Chancellor of Apostolic Chancery (1763.01.14 – 1807.07.13) |
| 1807.08.12 | Cardinal-Priest of Ss. Marcellino e Pietro (1777.07.28 – 1807.08.12) Archbishop-Bishop of Senigallia (Italy) (1777.07.28 – 1807.08.12) |
| 1807.08.27 | Cardinal-Priest of S. Maria in Traspontina (1776.07.15 – 1807.08.27) Archbishop-Bishop of Osimo (Italy) (1776.05.20 – 1807.08.27) Archbishop-Bishop of Cingoli (Italy) (1776.05.20 – 1807.08.27) |
| 1808.02.11 | |
| 1808.06.10 | Cardinal-Priest of S. Giovanni a Porta Latina (1805.02.01 – 1808.06.10) Metropolitan Archbishop of Paris (France) (1802.04.10 – 1808.06.10) |
| 1808.06.17 | Bishop emeritus of Metz (France) ([1760.08.21] 1761.04.06 – 1801 deposed) |
| 1808.08.09 | Cardinal-Priest of S. Prassede (1807.09.18 – 1808.08.09) Archbishop-Bishop of Cesena (Italy) (1795.09.22 – 1808.08.09) |
| 1808.12.29 | Cardinal-Bishop of Porto e Santa Rufina (1807.08.03 – 1808.12.29) Librarian of Vatican Apostolic Library (1802.01.12 – 1808.12.29) Archivist of Vatican Secret Archives (1802.01.12 – 1808.12.29) |
| 1809.01.23 | Cardinal-Deacon of S. Adriano al Foro (1803.09.26 – 1809.01.23) |
| 1809.05.13 | Cardinal-Priest of S. Lorenzo in Panisperna (1801.07.20 – 1809.05.13) Camerlengo of Sacred College of Cardinals (1809 – 1809.05.13) |
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