| Date of Death | Deceased Cardinals (35) |
| 1770.04.20 | Bishop of Speyer (Germany) ([1743.11.14] 1744.02.03 – 1770.04.20) |
| 1770.05.02 | Cardinal-Priest of S. Lorenzo in Lucina (1763.03.21 – 1770.05.02) Archbishop-Bishop emeritus of Viterbo (Italy) (1749.09.22 – 1770.03.22) Archbishop-Bishop emeritus of Tuscanella (Italy) (1749.09.22 – 1770.03.22) |
| 1770.12.06 | Cardinal-Deacon of S. Eustachio (1737.05.06 – 1770.12.06) Prefect of Supreme Tribunal of the Apostolic Signatura (1733.03.02 – 1770.12.06?) Archpriest of Papal Archbasilica of Saint John Lateran (1740 – 1770.12.06) Secretary of Commission of Roman and Universal Inquisition (1753 – 1770.12.06?) |
| 1770.12.14 | Cardinal-Priest of S. Stefano al Monte Celio (1763.03.21 – 1770.12.14) |
| 1771.01.10 | Cardinal-Priest of S. Crisogono (1766.12.01 – 1771.01.10) |
| 1771.03.26 | Metropolitan Archbishop of Toledo (Spain) (1755.08.04 – 1771.03.26) |
| 1771.07.12 | Cardinal-Deacon of S. Maria in Portico (1759.02.12 – 1771.07.12) Prefect of Congregation for Sacred Rites (1759? – 1771.07.12) |
| 1772.02.24 | Cardinal-Deacon of S. Giorgio in Velabro (1759.11.19 – 1772.02.24) |
| 1772.10.26 | Cardinal-Priest of S. Marco (1762.04.19 – 1772.10.26) |
| 1773.03.03 | Cardinal-Bishop of Porto e Santa Rufina (1763.07.18 – 1773.03.03) Prefect of Sacred Congregation of Good Government (1759.02.13 – 1773.03.03) |
| 1773.03.14 | Cardinal-Priest of S. Sisto (1769.06.26 – 1773.03.14) |
| 1773.03.20 | Cardinal-Deacon of S. Maria della Scala (1766.12.01 – 1773.03.20) |
| 1773.11.15 | Cardinal-Priest of SS. Trinità al Monte Pincio (1759.11.19 – 1773.11.15) Camerlengo emeritus of Sacred College of Cardinals (1768.01.25 – 1769) |
| 1774.01.07 | Metropolitan Archbishop of Besançon (France) (1755.03.17 – 1774.01.07) |
| 1774.03.07 | Cardinal-Bishop of Ostia–Velletri (1763.05.16 – 1774.03.07) Datary of His Holiness of Apostolic Dataria (1758.07.15 – 1774.03.07) |
| 1774.07.24 | Cardinal-Priest of S. Agnese fuori le mura (1758.08.02 – 1774.07.24) Bishop emeritus of Beauvais (France) (1728.04.24 – 1772.05.22) |
| 1774.11.18 | Cardinal-Bishop of Palestrina (1763.07.18 – 1774.11.18) Secretary of Commission of Roman and Universal Inquisition (1770.12.12 – 1774.11.18) |
| 1775.02.04 | Cardinal-Priest of S. Cecilia (1767.12.14 – 1775.02.04) Patriarch emeritus of Constantinople (1751.02.01 – 1759.09.24) Prefect of Sacred Congregation of the Council (1759.09.28 – 1775.02.04) |
| 1775.03.21 | Cardinal-Priest of Ss. XII Apostoli (1769.06.26 – 1775.03.21) Metropolitan Archbishop of Sevilla (Spain) (1755.11.17 – 1775.03.21) |
| 1775.06.24 | Cardinal-Priest of S. Pudenziana (1754.05.20 – 1775.06.24) Metropolitan Archbishop of Napoli (Italy) (1754.02.11 – 1775.06.24) |
| 1775.10.16 | Cardinal-Priest of S. Maria del Popolo (1758.08.02 – 1775.10.16) Bishop of Konstanz (Germany) ([1750.11.09] 1751.03.15 – 1775.10.16) |
| 1775.12.03 | Cardinal-Priest of Ss. Marcellino e Pietro (1753.12.10 – 1775.12.03) Metropolitan Archbishop of Bologna (Italy) (1754.01.14 – 1775.12.03) Datary of His Holiness of Apostolic Dataria (1774.06.14 – 1775.12.03) |
| 1775.12.07 | Cardinal-Bishop of Ostia–Velletri (1774.04.18 – 1775.12.07) |
| 1775.12.24 | Cardinal-Deacon of S. Cesareo in Palatio (1775.05.29 – 1775.12.24) |
| 1776.04.27 | Cardinal-Priest of S. Giovanni a Porta Latina (1763.08.22 – 1776.04.27) Camerlengo emeritus of Sacred College of Cardinals (1772.01.27 – 1773) |
| 1776.08.12 | Cardinal-Deacon of Ss. Cosma e Damiano (1766.12.01 – 1776.08.12) Prefect of Sacred Congregation of the Index (1775? – 1776.08.12) |
| 1776.11.01 | |
| 1777.01.02 | Cardinal-Priest of S. Callisto (1767.06.15 – 1777.01.02) Metropolitan Archbishop of Fermo (Italy) (1764.07.09 – 1777.01.02) |
| 1777.01.06 | Cardinal-Deacon of S. Agata alla Suburra (1765.04.22 – 1777.01.06) Secretary of State of Apostolic Secretariat (1758.10.08 – 1777.01.06) Secretary of Commission of Roman and Universal Inquisition (1775.02.22 – 1777.01.06) |
| 1777.03.20 | Cardinal-Priest of S. Eusebio (1762.01.25 – 1777.03.20) Bishop of Laon (France) ([1741.06.25] 1741.09.18 – 1777.03.20) |
| 1777.05.06 | Cardinal-Priest of S. Lorenzo in Panisperna (1769.06.26 – 1777.05.06) Patriarch of Indias Occidentales (1761.04.06 – 1777.05.06) |
| 1777.10.27 | Metropolitan Archbishop of Reims (France) ([1762.12.05] 1763.01.24 – 1777.10.27) |
| 1778.10.01 | Cardinal-Priest of S. Pietro in Vincoli (1767.04.06 – 1778.10.01) Camerlengo emeritus of Sacred College of Cardinals (1767.02.16 – 1768) |
| 1779.03.11 | Bishop of Strasbourg (France) (1756.09.23 – 1779.03.11) |
| 1779.12.11 | Cardinal-Deacon of S. Maria in Via Lata (1747.04.10 – 1779.12.11) Cardinal-Deacon of S. Maria in Cosmedin in commendum (1741.08.07 – 1779.12.11) Commendatory Abbot of Nonantola (Italy) (1724.06 – 1779.12.11) Librarian of Vatican Apostolic Library (1761.08.12 – 1779.12.11) Archivist of Vatican Secret Archives (1761.08.12 – 1779.12.11) |
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