| Date of Death | Deceased Bishops (63) |
| 1903.01.03 | |
| 1903.01.04 | Vicar Apostolic of Hawaiian Islands (USA) (1892.06.03 – 1903.01.04) |
| 1903.01.15 | Cardinal-Bishop of Porto e Santa Rufina (1896.11.30 – 1903.01.15) Cardinal-Priest of S. Lorenzo in Damaso in commendum (1899.12.14 – 1903.01.15) Vice-Chancellor of Apostolic Chancery (1899.12.14 – 1903.01.15) Secretary of Commission of Roman and Universal Inquisition (1896 – 1903.01.15) |
| 1903.01.16 | |
| 1903.01.22 | Archbishop-Bishop emeritus of Cortona (Italy) (1896.06.22 – 1901.08.08) |
| 1903.01.30 | Titular Archbishop of Melitene (1875.09.17 – 1903.01.30) |
| 1903.02.02 | Metropolitan Archbishop of Kirkuk of the Chaldeans (Iraq) (1900.07.13 – 1903.02.02) |
| 1903.02.07 | Bishop of Coimbatore (India) (1886.09.01 – 1903.02.07) |
| 1903.02.09 | Bishop of Piazza Armerina (Italy) (1887.03.18 – 1903.02.09) |
| 1903.02.12 | |
| 1903.02.14 | |
| 1903.02.24 | Metropolitan Archbishop of Mohilev (Belarus) (1901.04.15 – 1903.02.24) |
| 1903.03.05 | |
| 1903.03.12 | Bishop of Colle di Val d’Elsa (Italy) (1891.12.14 – 1903.03.12) |
| 1903.03.13 | |
| 1903.03.15 | Auxiliary Bishop of Münster (Germany) (1884.11.13 – 1903.03.15) |
| 1903.03.21 | Metropolitan Archbishop of Pisa (Italy) (1883.03.08 – 1903.03.21) |
| 1903.03.22 | Bishop emeritus of Chatham (Canada) (1860.05.08 – 1902.08.07) |
| 1903.04.01 | |
| 1903.04.11 | Ordinary of Silicia of the Italo-Albanese (Italy) (1878.01.29 – 1903.04.11) |
| 1903.04.13 | Bishop emeritus of Capaccio–Vallo (Italy) (1876.12.18 – 1900.12.17) |
| 1903.04.17 | |
| 1903.04.20 | Bishop emeritus of Sora (Italy) (1887.03.14 – 1899.12.14) Bishop emeritus of Pontecorvo (Italy) (1887.03.14 – 1899.12.14) |
| 1903.04.25 | |
| 1903.04.27 | |
| 1903.04.27 | Bishop of Chachapoyas (Peru) (1865.03.27 – 1903.04.27) |
| 1903.05.01 | Bishop emeritus of Langres (France) (1884.11.13 – 1899.12.14) |
| 1903.05.01 | Auxiliary Bishop emeritus of Kujawy–Kaliska (Poland) (1884.03.24 – 1889.12.30) |
| 1903.05.03 | |
| 1903.05.17 | Bishop of Ajaccio (France) ([1899.12.07] 1899.12.14 – 1903.05.17) |
| 1903.05.27 | Military Vicar of Germany (Germany) (1888.06.01 – 1903.05.27) |
| 1903.06.06 | |
| 1903.06.08 | Bishop emeritus of Mazara del Vallo (Italy) (1900.06.15 – 1903.04.01) |
| 1903.06.19 | Cardinal-Priest of Ss. Andrea e Gregorio al Monte Celio (1893.01.19 – 1903.06.19) Metropolitan Archbishop of Westminster (England) (1892.04.08 – 1903.06.19) Superior General of Saint Joseph’s Missionary Society of Mill Hill (1868 – 1903.06.19) |
| 1903.07.05 | |
| 1903.07.09 | Auxiliary Bishop of Athabaska (Canada) (1864.08.03 – 1903.07.09) |
| 1903.07.20 | Supreme Pontiff (1878.02.20 [1878.03.03] – 1903.07.20) |
| 1903.07.20 | Bishop-Prelate emeritus of Santa Lucia del Mela (Italy) (1896.10.21 – 1901.03.04) |
| 1903.07.20 | Metropolitan Archbishop of Milwaukee (USA) (1891.01.30 – 1903.07.20) |
| 1903.07.30 | Bishop emeritus of Antioquía (Colombia) (1892.01.30 – 1900?) |
| 1903.08.15 | |
| 1903.08.22 | Vicar Apostolic emeritus of Arabia (United Arab Emirates) (1889.06.28 – 1900.04) |
| 1903.09.01 | |
| 1903.09.15 | Vicar Apostolic of Natal (South Africa) (1874.09.15 – 1903.09.15) |
| 1903.09.27 | Metropolitan Archbishop of Urbino (Italy) (1889.12.30 – 1903.09.27) |
| 1903.09.30 | Bishop emeritus of Haarlem (Netherlands) (1883.08.14 – 1903.09.11) |
| 1903.10.08 | Vicar Apostolic of Northwestern Hupeh 湖北西北 (China) (1879.09.30 – 1903.10.08) |
| 1903.10.11 | Bishop of Trento (Italy) ([1886.04.24] 1886.06.06 – 1903.10.11) |
| 1903.10.13 | Metropolitan Archbishop of Saint Louis (USA) (1895.05.21 – 1903.10.13) |
| 1903.10.13 | Bishop emeritus of Cariati (Italy) (1877.03.12 – 1903.02.23) |
| 1903.10.21 | Bishop of Vannes (France) ([1898.03.22] 1898.03.24 – 1903.10.21) |
| 1903.11.02 | |
| 1903.11.03 | |
| 1903.11.05 | Bishop of Mainz (Germany) ([1899.12.21] 1900.03.30 – 1903.11.05) |
| 1903.11.12 | |
| 1903.11.16 | Bishop of Nevers (France) ([1877.08.21] 1877.09.21 – 1903.11.16) |
| 1903.11.23 | Bishop emeritus of Montepulciano (Italy) (1890.04.23 – 1898.11.28) |
| 1903.11.24 | Vicar Apostolic of Southern Shandong 山東南境 (China) (1886.01.04 – 1903.11.24) |
| 1903.12.05 | Auxiliary Bishop of Milano (Italy) (1903.01.23 – 1903.12.05) |
| 1903.12.09 | Cardinal-Priest of Ss. Bonifacio ed Alessio (1903.08.27 – 1903.12.09) Metropolitan Archbishop of Valencia (Spain) (1898.03.24 – 1903.12.09) |
| 1903.12.13 | Metropolitan Archbishop emeritus of Santiago (Cuba) (1894.05.21 – 1899.04.27) |
| 1903.12.13 | Bishop of Manchester (USA) (1884.04.18 – 1903.12.13) |
| 1903.12.15 | Vicar Apostolic of Gold Coast (Ghana) (1901.05.25 – 1903.12.15) |
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