| Date of Death | Deceased Bishops (73) |
| 1921.01.05 | Bishop of Brugnato (Italy) (1899.06.19 – 1921.01.05) Bishop of Luni–Sarzana (Italy) (1899.06.19 – 1921.01.05) |
| 1921.01.10 | |
| 1921.01.15 | Vicar Apostolic emeritus of Southern Tonking (Vietnam) (1886.05.21 – 1910.06.02) |
| 1921.01.18 | Cardinal-Priest of S. Maria in Ara Coeli (1919.12.18 – 1921.01.18) Patriarch emeritus of Jerusalem (Palestine) (1906.12.06 – 1919.12.18) |
| 1921.01.21 | |
| 1921.01.22 | |
| 1921.01.25 | |
| 1921.01.28 | Metropolitan Archbishop of Liverpool (England) (1911.10.28 – 1921.01.28) |
| 1921.01.29 | |
| 1921.01.31 | Auxiliary Bishop of Freiburg im Breisgau (Germany) (1894.02.04 – 1921.01.31) |
| 1921.02.02 | Cardinal-Priest of S. Anastasia (1894.05.21 – 1921.02.02) Metropolitan Archbishop of Milano (Italy) (1894.05.21 – 1921.02.02) |
| 1921.02.03 | Bishop of Nîmes (France) ([1896.05.30] 1896.06.25 – 1921.02.03) |
| 1921.02.06 | Metropolitan Archbishop emeritus of Alger–Iulia Caesarea (Algeria) ([1898.07.08] 1898.11.28 – 1907.12.15) |
| 1921.02.12 | |
| 1921.02.15 | Bishop emeritus of Hyderabad (India) (1897.10.25 – 1909.05.11) Auxiliary Bishop emeritus of Tortona (Italy) (1909.05.11 – 1917) |
| 1921.02.17 | Bishop of Puerto Rico (Puerto Rico) (1907.01.15 – 1921.02.17) |
| 1921.02.18 | |
| 1921.02.22 | Bishop of Hradec Králové (Czechia) (1903.06.22 – 1921.02.22) |
| 1921.03.06 | Archbishop emeritus of Barletta (Italy) (1893.01.16 – 1898.01.08) Metropolitan Archbishop emeritus of Trani (Italy) (1893.01.16 – 1898.01.08) |
| 1921.03.19 | Bishop of Clermont (France) ([1893.01.03] 1893.01.19 – 1921.03.19) |
| 1921.03.19 | |
| 1921.03.21 | Coadjutor Vicar Apostolic of Eastern Cochin (Vietnam) (1911.08.24 – 1921.03.21) |
| 1921.03.21 | Auxiliary Bishop of Köln (Germany) (1903.04.30 – 1921.03.21) |
| 1921.03.24 | Cardinal-Priest of S. Maria in Trastevere (1887.03.17 – 1921.03.24) Metropolitan Archbishop of Baltimore (USA) (1877.10.03 – 1921.03.24) |
| 1921.04.01 | Auxiliary Bishop of Split (Croatia) (1904.06.16 – 1921.04.01) |
| 1921.04.08 | |
| 1921.04.09 | Metropolitan Archbishop of Dublin (Ireland) (1885.07.03 – 1921.04.09) |
| 1921.04.15 | Bishop of Mainz (Germany) ([1903.11.30] 1904.02.08 – 1921.04.15) |
| 1921.04.16 | Bishop emeritus of Metz (France) ([1901.09.08] 1901.09.21 – 1919.07.10) |
| 1921.04.23 | Bishop of Ogdensburg (USA) (1891.12.20 – 1921.04.23) |
| 1921.05.09 | |
| 1921.05.17 | |
| 1921.05.18 | Patriarch emeritus of Alexandria of the Copts (Egypt) (1899.06.19 – 1908.05.18) |
| 1921.05.21 | Auxiliary Bishop of Santiago (Chile) (1908.06.01 – 1921.05.21) |
| 1921.05.22 | |
| 1921.05.25 | Bishop of Providence (USA) (1887.02.11 – 1921.05.25) |
| 1921.05.27 | Vicar Apostolic of Tracia of the Bulgarians (Turkiye) (1883.04.10 – 1921.05.27) |
| 1921.05.31 | |
| 1921.06.06 | |
| 1921.06.18 | |
| 1921.06.24 | |
| 1921.07.09 | Metropolitan Archbishop of Cuiabá (Brazil) (1910.03.10 – 1921.07.09) |
| 1921.07.12 | Titular Archbishop of Beirut (1891.02.13 – 1921.07.12) |
| 1921.07.14 | Bishop emeritus of Colle di Val d’Elsa (Italy) (1903.06.22 – 1921.01.15) |
| 1921.07.18 | Titular Archbishop of Marcianopolis (1901.02.20 – 1921.07.18) |
| 1921.07.18 | Bishop of San Severo (Italy) (1912.11.05 – 1921.07.18) |
| 1921.08.08 | |
| 1921.08.11 | Metropolitan Archbishop of Tegucigalpa (Honduras) (1916.02.02 – 1921.08.11) |
| 1921.08.17 | Bishop of Sezze (Italy) (1899.12.19 – 1921.08.17) |
| 1921.08.18 | Bishop emeritus of San Luis Potosí (Mexico) (1884.11.13 – 1920.12.16) |
| 1921.08.22 | Bishop of Annecy (France) ([1902.05.13] 1902.06.09 – 1921.08.22) |
| 1921.08.22 | Titular Bishop of Zenopolis (1898.03.24 – 1921.08.22) |
| 1921.08.24 | Cardinal-Priest of S. Susanna (1915.12.09 – 1921.08.24) Metropolitan Archbishop of Bologna (Italy) (1914.09.08 – 1921.08.24) |
| 1921.09.10 | |
| 1921.09.18 | Bishop of Sioux Falls (USA) (1896.01.24 – 1921.09.18) |
| 1921.09.19 | |
| 1921.09.22 | Cardinal-Priest of S. Balbina (1916.12.07 – 1921.09.22) Metropolitan Archbishop of Rennes (France) (1906.08.06 – 1921.09.22) |
| 1921.10.03 | Vicar Apostolic of Haut-Congo français (Congo-Brazzaville) (1890.10.14 – 1921.10.03) |
| 1921.10.17 | Metropolitan Archbishop emeritus of Agra (India) (1892.01.02 – 1897.04.27) |
| 1921.10.17 | |
| 1921.10.22 | Bishop emeritus of Massa Carrara (Italy) (1909.04.29 – 1917.01.07) |
| 1921.10.28 | |
| 1921.11.08 | |
| 1921.11.19 | Vicar Apostolic of Urubamba y Madre de Dios (Peru) (1913.07.04 – 1921.11.19) |
| 1921.11.25 | Patriarchal Vicar of Egypt and Sudan of the Greek-Melkites (Egypt) (1920.04.25 – 1921.11.25) |
| 1921.12.03 | Titular Archbishop of Traianopolis of the Armenians (1877.05.02 – 1921.12.03) |
| 1921.12.04 | |
| 1921.12.09 | Vicar Apostolic emeritus of Méndez y Gualaquiza (Ecuador) (1895.03.18 – 1919) |
| 1921.12.15 | Bishop emeritus of Saint Cloud (USA) (1897.07.05 – 1914.04.15) |
| 1921.12.18 | Metropolitan Archbishop of Ravenna (Italy) (1904.11.14 – 1921.12.18) |
| 1921.12.21 | Cardinal-Priest of S. Maria della Vittoria (1911.11.30 – 1921.12.21) Bishop of Montpellier (France) (1874.01.16 – 1921.12.21) |
| 1921.12.26 | |
| 1921.12.27 | Bishop of Sacramento (USA) (1896.02.27 – 1921.12.27) |
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