| Bishops (57) | Elected | Consecrated |
 Bishop Carlos de Jesús Mejía y Laguana, C.M.former Bishop of Tehuantepec (Mexico) | 1902.09.15 | 1903.01.11 |
 Bishop Federico Domenico Salaformer Auxiliary Bishop of Milano (Italy) | 1903.01.23 | 1903.02.15 |
| Bishop Giuseppe Astuni former Titular Bishop of Hierocæsarea | 1903.01.21 | 1903.02.22 |
 Bishop John Francis Regis Canevinformer Bishop of Pittsburgh (USA) | 1903.01.16 | 1903.02.24 |
 Bishop Charles Algernon Stanleyformer Auxiliary Bishop of Westminster (England) | 1903.02.12 | 1903.03.15 |
 Archbishop Dionisio Efrem Naccàsché (Syriac Rite)former Archbishop of Aleppo of the Syriacs (Syria) | 1903.04.05 | 1903.04.05 |
 Bishop Giordano Zaninovic, O.P.former Bishop of Hvar–Brač–Vis (Croatia) | 1903.02.10 | 1903.04.19 |
 Bishop Alexander Párvyformer Bishop of Spiš (Slovakia) | 1903.03.27 | 1903.04.19 |
 Bishop Patrick Joseph O’Connorformer Bishop of Armidale (Australia) | 1903.01.10 | 1903.05.03 |
| Bishop Benedetto Spila former Bishop of Alatri (Italy) | 1903.04.03 | 1903.05.10 |
 Bishop Isidoro Badía y Sarradelformer Bishop of Tarazona (Spain) | 1903.01.09 | 1903.05.17 |
| Bishop Luca Canepa former Bishop of Galtellì–Nuoro (Italy) | 1903.02.15 | 1903.05.21 |
 Bishop Joseph Müllerformer Auxiliary Bishop of Köln (Germany) | 1903.04.30 | 1903.06.07 |
 Bishop Etienne Apikian (Armenian Rite)former Bishop of Trapezus of the Armenians (Turkiye) | 1903.04.06 | 1903.06.14 |
| Cardinal Dennis Joseph Dougherty former Cardinal-Priest of Ss. Nereo ed Achilleo former Metropolitan Archbishop of Philadelphia (USA) | 1903.06.12 | 1903.06.14 |
 Bishop Frederick Zadok Rookerformer Bishop of Jaro (Philippines) | 1903.06.12 | 1903.06.14 |
 Archbishop Ismael Perdomo Borreroformer Metropolitan Archbishop of Bogotá in Colombia (Colombia) | 1903.04.29 | 1903.06.19 |
| Archbishop Anselmo Filippo Pecci, O.S.B. former Archbishop of Matera (Italy) former Metropolitan Archbishop of Acerenza (Italy) | 1903.06.22 | 1903.06.28 |
| Bishop Salvatore Frattocchi former Bishop of Orvieto (Italy) | 1903.06.22 | 1903.06.28 |
| Bishop Francesco Maria Raiti, O. Carm. former Bishop of Trapani (Italy) | 1903.06.22 | 1903.06.28 |
| Bishop Francesco Maria Traina former Bishop of Patti (Italy) | 1903 | 1903.06.29 |
| Bishop Rafael Amador y Hernández former Bishop of Huajuapan de León (Mexico) | 1903.05.08 | 1903.06.29 |
| Archbishop Ferdinando Fiandaca former Bishop of Patti (Italy) | 1903.06.22 | 1903.06.29 |
| Archbishop Prospero Scaccia former Metropolitan Archbishop of Siena (Italy) | 1903.06.22 | 1903.06.29 |
 Bishop Giuseppe Doubravaformer Bishop of Hradec Králové (Czechia) | 1903.06.22 | 1903.06.29 |
| Bishop Massimiliano Novelli former Bishop of Colle di Val d’Elsa (Italy) | 1903.06.22 | 1903.06.29 |
| Bishop Mario Sturzo former Bishop of Piazza Armerina (Italy) | 1903.06.22 | 1903.06.29 |
| Bishop Pietro Terroni former Bishop of Borgo San Donnino (Italy) | 1903.06.22 | 1903.06.29 |
| Archbishop Ludovico Gavotti former Metropolitan Archbishop of Genova (Italy) | 1903.06.22 | 1903.07.05 |
| Archbishop Robert John Seton former Titular Archbishop of Heliopolis | 1903.06.22 | 1903.07.05 |
| Bishop Lorenzo Chieppa former Bishop of Lucera (Italy) | 1903.06.22 | 1903.07.05 |
| Cardinal Vittorio Amedeo Ranuzzi de’ Bianchi former Cardinal-Priest of S. Prisca former Bishop of Recanati (Italy) former Prefect of Prefecture of the Holy Apostolic Palaces | 1903.06.22 | 1903.07.12 |
| Bishop Libert Hubert John Louis Boeynaems, SS.CC. former Vicar Apostolic of Hawaiian Islands (USA) | 1903.04.08 | 1903.07.25 |
| Archbishop Jeremiah James Harty former Archbishop-Bishop of Omaha (USA) | 1903.06.06 | 1903.08.15 |
| Bishop Francisco Uranga y Sáenz former Bishop of Cuernavaca (Mexico) | 1903.06.25 | 1903.08.16 |
| Bishop Thomas Augustine Hendrick former Bishop of Cebu (Philippines) | 1903.07.17 | 1903.08.23 |
| Cardinal Aristide Cavallari former Cardinal-Priest of S. Maria in Cosmedin pro hac vice Title former Patriarch of Venezia (Italy) | 1903.08.09 | 1903.08.23 |
| Bishop Charles Henry Colton former Bishop of Buffalo (USA) | 1903.06.10 | 1903.08.24 |
| Bishop Charles Joseph O’Reilly former Bishop of Lincoln (USA) | 1903.06.25 | 1903.08.25 |
 Bishop Thomas O’Deaformer Bishop of Galway and Kilmacduagh (Ireland) | 1903.06.10 | 1903.08.30 |
| Bishop José Amador Velasco y Peña former Bishop of Colima (Mexico) | 1903.07.17 | 1903.08.30 |
 Bishop Vasile Hossu (Romanian Rite)former Bishop of Gherla, Armenopoli, Szamos-Ujvár of the Romanians (Romania) | 1903.06.25 | 1903.09.21 |
| Bishop Louis Charles Casartelli former Bishop of Salford (England) | 1903.08.28 | 1903.09.21 |
| Bishop Carlo Marozio former Bishop of Susa (Italy) | 1903.06.22 | 1903.10.04 |
| Bishop Ricardo Cortés y Cullel former Auxiliary Bishop of Barcelona (Spain) | 1903.06.25 | 1903.10.25 |
 Bishop Braulio Orúe Vivancoformer Bishop of Pinar del Río (Cuba) | 1903.02.20 | 1903.10.28 |
| Bishop Bonaventure Finbarr Francis Broderick former Coadjutor Bishop of La Habana (Cuba) | 1903.09.07 | 1903.10.28 |
 Bishop Augustinus Josephus Callierformer Bishop of Haarlem (Netherlands) | 1903.09.11 | 1903.10.28 |
 Bishop John Joseph O’Gorman, C.S.Sp.former Vicar Apostolic of Sierra Leone (Sierra Leone) | 1903.09.14 | 1903.10.28 |
| Bishop Pedro Ladislao González y Estrada former Bishop of La Habana (Cuba) | 1903.09.16 | 1903.10.28 |
 Archbishop José Alves de Mattosformer Auxiliary Bishop of Lisboa (Portugal) | 1903.06.22 | 1903.11.08 |
 Bishop Franz Xavier Geyer, F.S.C.I.former Vicar Apostolic of Khartoum (Sudan) | 1903.08.06 | 1903.11.08 |
 Bishop Jean-Charles Arnal du Curelformer Bishop of Monaco (Monaco) | 1903.10.02 | 1903.11.08 |
 Bishop Giovanni Menicatti (梅占魁), P.I.M.E.former Vicar Apostolic of Northern Honan 河南北境 (China) | 1903.09.12 | 1903.11.22 |
| Patriarch Dimitri I Cadi [Qâdî] (Greek-Melkite Rite) former Patriarch of Antioch of the Greek-Melkites (Syria) | 1903.10.27 | 1903.11.29 |
| Archbishop Pierre-Macario Saba (Greek-Melkite Rite) former Metropolitan Archbishop of Aleppo of the Greek-Melkites (Syria) | 1903.11.29 | 1903.11.29 |
 Archbishop Julien-Jean-Guillaume Conanformer Metropolitan Archbishop of Port-au-Prince (Haiti) | 1903.10.22 | 1903.12.13 |
