| Date of Death | Deceased Cardinals (38) |
| 1820.01.24 | Cardinal-Bishop of Palestrina (1814.09.26 – 1820.01.24) Cardinal-Priest of S. Agostino in commendum (1814.09.26 – 1820.01.24) Prefect of Supreme Tribunal of the Apostolic Signatura (1818.12.14 – 1820.01.24) |
| 1820.01.27 | Cardinal-Priest of S. Anastasia (1817.11.15 – 1820.01.27) |
| 1820.02.08 | Bishop emeritus of Orihuela (Spain) (1797.07.23 – 1815.07.10) |
| 1820.04.20 | Cardinal-Bishop of Ostia–Velletri (1814.09.26 – 1820.04.20) Archbishop emeritus of Ferrara (Italy) (1777.02.17 – 1800.04.02) |
| 1820.05.01 | Cardinal-Bishop of Sabina (1814.09.26 – 1820.05.01) Vicar General for the Vicariate of Rome of Roma (Italy) (1818.09.28 – 1820.05.01) |
| 1820.09.15 | Cardinal-Priest of S. Maria in Ara Coeli (1816.09.23 – 1820.09.15) Prefect of Supreme Tribunal of the Apostolic Signatura (1820.05.10 – 1820.09.15) |
| 1821.01.31 | Cardinal-Deacon of S. Maria in Via Lata (1800.04.02 – 1821.01.31) Archpriest of Papal Basilica of Saint Mary Major (1819.10.10 – 1821.01.31) |
| 1821.06.21 | |
| 1821.07.02 | Cardinal-Bishop of Porto e Santa Rufina (1820.05.29 – 1821.07.02) Prefect of Sacred Congregation of the Index (1818 – 1821.07.02?) Major Penitentiary of Sacred Apostolic Penitentiary (1814.05.20 – 1821.07.02) |
| 1821.10.20 | Metropolitan Archbishop of Paris (France) (1817.10.01 – 1821.10.20) |
| 1822.03.19 | Cardinal-Priest of S. Maria sopra Minerva (1816.04.29 – 1822.03.19) Prefect of Sacred Congregation of the Propagation of the Faith (1818.09.24 – 1822.03.19) Superior General of Clerics Regular of Saint Paul (Barnabites) (1807 – 1822.03.19) |
| 1822.04.19 | |
| 1822.08.31 | Cardinal-Priest of Ss. Marcellino e Pietro (1816.04.29 – 1822.08.31) Bishop of Ancona e Umana (Italy) (1816.03.08 – 1822.08.31) |
| 1822.09.06 | Cardinal-Priest of Ss. Nereo ed Achilleo (1816.04.29 – 1822.09.06) |
| 1822.09.26 | Cardinal-Priest of S. Lorenzo in Lucina (1819.12.17 – 1822.09.26) Bishop emeritus of Senigallia (Italy) (1808.01.11 – 1816.02.05) Pro-Datary of His Holiness of Apostolic Dataria (1820.05.12 – 1822.09.26) |
| 1823.03.19 | Cardinal-Priest of S. Maria della Scala pro hac vice Title (1800.10.20 – 1823.03.19) Metropolitan Archbishop emeritus of Toledo (Spain) (1800.12.22 – 1814.12.29) |
| 1823.04.13 | Cardinal-Priest of S. Balbina (1801.12.23 – 1823.04.13) Metropolitan Archbishop of Siena (Italy) (1795.06.01 – 1823.04.13) |
| 1823.05.08 | |
| 1823.12.21 | Cardinal-Priest of S. Callisto (1816.04.29 – 1823.12.21) Metropolitan Archbishop of Benevento (Italy) (1796.06.27 – 1823.12.21) |
| 1824.01.24 | Cardinal-Deacon of S. Maria ad Martyres (1817.07.28 – 1824.01.24) Secretary of State of Apostolic Secretariat (1814.05.19 – 1824.01.24) Prefect of Sacred Congregation of the Propagation of the Faith (1824.01.13 – 1824.01.24) |
| 1824.02.02 | Cardinal-Priest of S. Sabina (1823.05.16 – 1824.02.02) |
| 1824.06.21 | Bishop emeritus of Alès (France) ([1784.02.23] 1784.06.25 – 1801.09.22) |
| 1824.09.08 | Cardinal-Priest of S. Maria della Pace (1817.10.01 – 1824.09.08) Archbishop-Bishop of Viterbo (Italy) (1808.01.11 – 1824.09.08) Archbishop-Bishop of Tuscanella (Italy) (1808.01.11 – 1824.09.08) Datary of His Holiness of Apostolic Dataria (1823 – 1824.09.08) |
| 1824.09.09 | Cardinal-Priest of S. Pietro in Vincoli (1823.11.24 – 1824.09.09) |
| 1825.08.01 | Cardinal-Priest of Ss. Giovanni e Paolo (1816.04.29 – 1825.08.01) |
| 1825.12.10 | Cardinal-Priest of S. Marco (1817.04.14 – 1825.12.10) |
| 1825.12.14 | |
| 1826.05.11 | Cardinal-Deacon of S. Maria ad Martyres (1825.03.21 – 1826.05.11) |
| 1826.11.09 | Cardinal-Priest of S. Maria in Ara Coeli (1823.05.16 – 1826.11.09) |
| 1826.12.03 | Cardinal-Priest of S. Agnese fuori le mura (1822.09.27 – 1826.12.03) |
| 1827.08.27 | Cardinal-Priest of S. Anastasia (1822.04.19 – 1827.08.27) |
| 1827.12.13 | Cardinal-Deacon of S. Maria in Via Lata (1821.06.27 – 1827.12.13) Datary of His Holiness emeritus of Apostolic Dataria (1819.03.29 – 1820.02.21) |
| 1828.02.06 | Cardinal-Priest of S. Prassede (1823.05.16 – 1828.02.06) Dean emeritus of Sacred Roman Rota (1817.07.28 – 1823.03.10) |
| 1828.04.20 | Cardinal-Priest of S. Marcello (1802.09.20 – 1828.04.20) Archbishop-Bishop of Parma (Italy) (1804.05.28 – 1828.04.20) |
| 1828.11.13 | Cardinal-Bishop of Palestrina (1820.02.21 – 1828.11.13) Prefect of Supreme Tribunal of the Apostolic Signatura (1824 – 1828.11.13) |
| 1828.12.05 | Cardinal-Deacon of S. Maria in Aquiro (1818.05.25 – 1828.12.05) Prefect of Sacred Congregation of Good Government (1824.02 – 1828.12.05) |
| 1829.02.18 | Prefect emeritus of Prefecture of the Holy Apostolic Palaces (1823.03.10 – 1828.12.15) |
| 1829.12.10 | Cardinal-Priest of S. Maria in Traspontina (1823.11.24 – 1829.12.10) Metropolitan Archbishop of Sens (France) ([1817.08.08] 1817.10.01 – 1829.12.10) |
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