| Date of Death | Deceased Cardinals (37) |
| 1550.01.31 | Cardinal-Deacon of S. Maria in Via Lata (1540.05.31 – 1550.01.31) Metropolitan Archbishop emeritus of Firenze (Italy) (1543.01.08 – 1548.05.25) Provost of Santo Stefano di Prato (Italy) (1507 – 1550.01.31) |
| 1550.02.21 | Cardinal-Bishop of Frascati (1543.09.24 – 1550.02.21) |
| 1550.04.14 | Cardinal-Deacon of S. Maria in Via Lata (1550.02.28 – 1550.04.14) Metropolitan Archbishop of Genova (Italy) (1520.05.11 – 1550.04.14) |
| 1550.05.10 | Cardinal-Deacon of S. Onofrio (1519.01.07 – 1550.05.10) |
| 1550.07.31 | Cardinal-Priest of S. Anastasia (1547.10.10 – 1550.07.31) |
| 1550.08.25 | Cardinal-Priest of Ss. Marcellino e Pietro (1550.02.28 – 1550.08.25) Metropolitan Archbishop of Rouen (France) (1511.08.08 – 1550.08.25) |
| 1551.01.30 | Cardinal-Deacon of S. Maria in Domnica (1550.06.27 – 1551.01.30) |
| 1551.12.17 | Metropolitan Archbishop of Esztergom (Hungary) (1551.10.12 – 1551.12.17) |
| 1552.01.16 | Cardinal-Priest of S. Maria in Via Lata pro hac vice Title (1551.11.20 – 1552.01.16) |
| 1552.05.28 | Cardinal-Priest of S. Marcello (1542.11.06 – 1552.05.28) |
| 1553.07.16 | Cardinal-Priest of S. Ciriaco alle Terme Diocleziane (1549.05.10 – 1553.07.16) Metropolitan Archbishop emeritus of Chieti (Italy) (1549.11.09 – 1553.07.14) |
| 1553.10.28 | Cardinal-Bishop of Porto e Santa Rufina (1546.10.08 – 1553.10.28) |
| 1553.11.23 | Cardinal-Priest of S. Callisto (1552.06.27 – 1553.11.23) Metropolitan Archbishop of Manfredonia (Italy) (1550.05.30 – 1553.11.23) |
| 1553.12.10 | Cardinal-Bishop of Ostia–Velletri (1537.11.28 – 1553.12.10) Archpriest of Papal Basilica of Saint Mary Major (1549? – 1553.12.10) Archpriest of Papal Archbasilica of Saint John Lateran (1535 – 1553.12.10) |
| 1554.09.21 | Cardinal-Priest of S. Lucia in Silice pro hac vice Title (1551.12.04 – 1554.09.21) Bishop emeritus of Bologna (Italy) (1526.03.19 – 1553.03.06) |
| 1555.10.10 | Cardinal-Priest of S. Marcello (1553.11.29 – 1555.10.10) Bishop emeritus of Capaccio (Italy) (1549.11.09 – 1553.03.01) |
| 1556.02.12 | Cardinal-Priest of S. Anastasia (1552.03.23 – 1556.02.12) |
| 1556.06.05 | Cardinal-Priest of S. Maria in Trastevere (1553.12.11 – 1556.06.05) Bishop emeritus of Viseu (Portugal) (1526.11.21 – 1547.04.22) |
| 1557.03.13 | Cardinal-Bishop of Palestrina (1550.02.24 – 1557.03.13) |
| 1557.05.31 | Cardinal-Priest of Ss. Nereo ed Achilleo (1556.02.01 – 1557.05.31) Metropolitan Archbishop of Toledo (Spain) (1546.01.08 – 1557.05.31) |
| 1557.06.06 | Cardinal-Priest of S. Susanna (1548.03.22 – 1557.06.06) |
| 1557.08.10 | Cardinal-Priest of Ss. Giovanni e Paolo (1556.06.12 – 1557.08.10) |
| 1557.09.15 | Cardinal-Bishop of Frascati (1555.05.29 – 1557.09.15) Metropolitan Archbishop of Santiago de Compostela (Spain) (1550.06.27 – 1557.09.15) |
| 1557.12.24 | Cardinal-Priest of Ss. XII Apostoli (1545.01.09 – 1557.12.24) |
| 1558.03.08 | Cardinal-Priest of Ss. Marcellino e Pietro (1551.12.04 – 1558.03.08) |
| 1558.03.25 | Cardinal-Deacon of S. Maria in Portico Octaviae (1555.05.29 – 1558.03.25) |
| 1558.04 | |
| 1558.08.05 | Cardinal-Priest of S. Callisto (1555.07.17 – 1558.08.05) Metropolitan Archbishop of Palermo (Italy) (1544.10.10 – 1558.08.05) |
| 1558.11.17 | Cardinal-Priest of S. Maria in Cosmedin pro hac vice Title (1555.12.01 – 1558.11.17) Metropolitan Archbishop of Canterbury (England) (1555.12.11 – 1558.11.17) |
| 1559.01.18 | Cardinal-Deacon of S. Maria in Domnica (1555.02.06 – 1559.01.18) Librarian of Vatican Apostolic Library (1555? – 1559.01.18) |
| 1559.03.13 | Cardinal-Deacon of S. Lucia in Silice (1556.01.13 – 1559.03.13) |
| 1559.05.22 | Cardinal-Priest of S. Simeone Profeta (1557.03.24 – 1559.05.22) Bishop of Ischia (Italy) (1554.08.27 – 1559.05.22) Vicar General for the Vicariate of Rome of Roma (Italy) (1558 – 1559.05.22) |
| 1559.06.25 | Cardinal-Priest of Ss. Giovanni e Paolo (1557.10.11 – 1559.06.25) |
| 1559.08.25 | Cardinal-Deacon of S. Nicola in Carcere (1558.12.16 – 1559.08.25) |
| 1559.11.25 | Cardinal-Priest of S. Crisogono (1550.02.28 – 1559.11.25) Bishop emeritus of Orléans (France) (1533.11.06 – 1550.10.20) |
| 1559.12.01 | Cardinal-Deacon of S. Giorgio in Velabro (1545.01.09 – 1559.12.01) Bishop of Saint-Jean-de-Maurienne (France) (1544.07.30 – 1559.12.01) |
| 1559.12.04 | Cardinal-Priest of S. Marcello (1555.10.25 – 1559.12.04) Bishop of Imola (Italy) (1558 – 1559.12.04) Secretary of State of Apostolic Secretariat (1555? – 1559.12.04) |
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