| Bishops (66) | Elected | Consecrated |
 Bishop Louis-Christian-Marie de Cooman, M.E.P.former Bishop of Thanh Hoá (Vietnam) | 1917.06.12 | 1918.01.06 |
 Bishop Flaminio Belotti (包海容), P.I.M.E.former Vicar Apostolic of Nanyangfu 南陽府 (China) | 1917.06.14 | 1918.01.06 |
 Bishop Antonio María Pueyo de Val, C.M.F.former Bishop of Pasto (Colombia) | 1917.11.26 | 1918.01.06 |
 Bishop Charles O’Sullivanformer Bishop of Ardfert and Aghadoe (Ireland) | 1917.11.10 | 1918.01.27 |
 Bishop Luca Piergiovanniformer Bishop of Tarquinia (Italy) former Bishop of Civitavecchia (Italy) | 1917.11.10 | 1918.02.02 |
 Bishop Jean-Joseph-Benoît-Marie Martelformer Bishop of Digne (France) | 1917.11.27 | 1918.02.02 |
 Archbishop John Mark Gannonformer Bishop of Erie (USA) former Archbishop ad personam | 1917.11.13 | 1918.02.06 |
| Bishop Henri Lécroart (劉欽明), S.J. former Vicar Apostolic of Xianxian 獻縣 (China) | 1917.07.30 | 1918.02.07 |
| Archbishop Joaquín Garcia Benitez, C.I.M. former Metropolitan Archbishop of Medellín (Colombia) | 1917.09.17 | 1918.02.17 |
| Archbishop Carmelo Patané former Archbishop of Catania (Italy) | 1918.01.11 | 1918.02.17 |
| Bishop Luigi Ferretti former Bishop of Macerata (Italy) former Bishop of Tolentino (Italy) | 1917.11.17 | 1918.02.24 |
 Bishop William Keatingeformer Military Vicar of Great Britain (England) | 1917.10.30 | 1918.02.25 |
| Bishop William Codd former Bishop of Ferns (Ireland) | 1917.12.07 | 1918.02.25 |
| Bishop Agostino Migliore former Bishop of Monopoli (Italy) | 1918.02.02 | 1918.03.10 |
| Bishop Denis Hallinan former Bishop of Limerick (Ireland) | 1918.03.10 | 1918.03.10 |
| Bishop Francesco Cammarota former Bishop of Policastro (Italy) former Bishop of Capaccio–Vallo (Italy) | 1917.12.17 | 1918.03.19 |
 Bishop Emilio Jiménez Pérezformer Titular Bishop of Anthedon former Apostolic Administrator of Barbastro (Spain) | 1918.01.04 | 1918.04.07 |
 Archbishop Antônio dos Santos Cabralformer Metropolitan Archbishop of Belo Horizonte (Brazil) | 1917.09.01 | 1918.04.14 |
| Cardinal Francesco Marchetti Selvaggiani former Cardinal-Bishop of Ostia former Cardinal-Bishop of Frascati former Prefect of Sacred Congregation of Ceremonies former President of Pontifical Commission for Sacred Archaeology former Archpriest of Papal Archbasilica of Saint John Lateran former Vicar General for the Vicariate of Rome of Roma (Italy) former Secretary of Supreme Sacred Congregation of the Holy Office | 1918.02.16 | 1918.04.14 |
| Cardinal Georges-François-Xavier-Marie Grente former Cardinal-Priest of S. Bernardo alle Terme former Archbishop-Bishop of Le Mans (France) | 1918.01.30 | 1918.04.17 |
| Bishop Benedito Paulo Alves de Souza former Bishop of Espírito Santo (Brazil) | 1918.01.28 | 1918.04.21 |
| Bishop Daniel Mary Gorman former Bishop of Boise City (USA) | 1918.02.06 | 1918.05.01 |
| Archbishop Joseph-Lucien Giray former Bishop of Cahors (France) | 1918.02.15 | 1918.05.01 |
| Bishop Giorgio Giovanni Elli former Bishop of Squillace (Italy) | 1918.02.23 | 1918.05.06 |
 Bishop Jean Forbes, M. Afr.former Coadjutor Vicar Apostolic of Uganda (Uganda) former Coadjutor Vicar Apostolic of Kampala (Uganda) | 1917.11.17 | 1918.05.19 |
 Cardinal Wilhelmus Marinus van Rossum, C.SS.R.former Cardinal-Priest of S. Croce in Gerusalemme former Prefect of Sacred Congregation of the Propagation of the Faith former President of Pontifical Commission for Biblical Studies | 1918.04.25 | 1918.05.19 |
| Bishop Matteo Múgica y Urrestarazu former Bishop of Vitoria (Spain) | 1918.02.22 | 1918.05.20 |
 Archbishop Luigi Francesco Pierini, O.F.M.former Metropolitan Archbishop of Sucre (Bolivia) | 1918.02.20 | 1918.05.30 |
 Bishop Luis Antonio Castro Alvarez, SS.CC.former Bishop of San Carlos de Ancud (Chile) former Auxiliary Bishop of Santiago (Chile) | 1918.02.21 | 1918.06.02 |
| Bishop Gilberto Fuenzalida Guzmán former Bishop of Concepción (Chile) | 1918.02.20 | 1918.06.07 |
| Bishop Carlos Silva Cotapos former Bishop of Talca (Chile) | 1918.02.20 | 1918.06.07 |
| Bishop Jonas de Araújo Batinga former Bishop of Penedo (Brazil) | 1918.01.28 | 1918.07.14 |
| Archbishop Thomas Joseph Walsh former Metropolitan Archbishop of Newark (USA) | 1918.05.10 | 1918.07.25 |
 Bishop Zygmunt Łozińskiformer Bishop of Pinsk (Belarus) | 1917.11.02 | 1918.07.28 |
 Bishop George Henry Bennettformer Bishop of Aberdeen (Scotland) | 1918.06.18 | 1918.08.01 |
| Archbishop Stefano Corbini former Bishop of Foligno (Italy) | 1918.06.18 | 1918.08.04 |
| Archbishop Helvécio Gomes de Oliveira, S.D.B. former Metropolitan Archbishop of Mariana (Brazil) | 1918.02.15 | 1918.08.15 |
| Bishop Giuseppe Signore former Bishop of Telese (Italy) | 1918.06.20 | 1918.08.24 |
 Bishop Jean-Baptiste Castanier (ジャン・バティスト・カスタニエ), M.E.P.former Bishop of Osaka 大阪 (Japan) | 1918.07.06 | 1918.08.29 |
 Archbishop William Haydenformer Archbishop of Hobart (Australia) | 1918.03.13 | 1918.09.08 |
| Venerable Archbishop Giovanni Jacono former Bishop of Caltanissetta (Italy) | 1918.07.02 | 1918.09.08 |
| Archbishop John Timothy McNicholas, O.P. former Metropolitan Archbishop of Cincinnati (USA) | 1918.07.18 | 1918.09.08 |
 Patriarch Luigi Barlassinaformer Patriarch of Jerusalem (Palestine) | 1918.08.09 | 1918.09.08 |
| Bishop Gabriel Llompart y Jaume Santandreu former Bishop of Mallorca (Spain) | 1918.05.17 | 1918.09.15 |
| Bishop Jean Castel former Bishop of Tulle (France) | 1918.08.03 | 1918.10.09 |
| Bishop Joseph Wilfrid Dwyer former Bishop of Wagga Wagga (Australia) | 1918.03.14 | 1918.10.13 |
| Bishop Marcial López y Criado former Bishop of Cádiz (Spain) | 1918.05.18 | 1918.10.20 |
| Bishop Joseph-Fructueux Bourgain (卜恩佑), M.E.P. former Vicar Apostolic of Ningyuanfu 寧遠府 (China) | 1918.03.31 | 1918.11.10 |
| Bishop Christopher Edward Byrne former Bishop of Galveston (USA) | 1918.07.18 | 1918.11.10 |
 Bishop Władysław Krynickiformer Bishop of Włocławek (Poland) | 1918.07.29 | 1918.11.10 |
| Bishop Adalberto Stanislao Owczarek former Auxiliary Bishop of Włocławek (Poland) | 1918.07.29 | 1918.11.10 |
 Bishop Jan Pacificus Bos, O.F.M. Cap.former Vicar Apostolic of Dutch Borneo (Indonesia) | 1918.03.13 | 1918.11.17 |
| Archbishop Stanisław Gall former Military Vicar of Poland (Poland) former Auxiliary Bishop of Warszawa (Poland) | 1918.07.29 | 1918.11.17 |
| Bishop Marian Leon Fulman former Bishop of Lublin (Poland) | 1918.09.24 | 1918.11.17 |
| Bishop Henryk Ignazio Przezdziecki former Bishop of Siedlce (Poland) | 1918.09.24 | 1918.11.17 |
 Bishop Adolf Peter Szelazekformer Bishop of Lutsk (Ukraine) | 1918.07.29 | 1918.11.24 |
 Archbishop Romuald Jałbrzykowskiformer Metropolitan Archbishop of Vilnius (Lithuania) | 1918.07.29 | 1918.11.30 |
 Bishop Nicolás Gonzalez Pérez, C.M.F.former Vicar Apostolic of Fernando Poo (Equatorial Guinea) | 1918.08.24 | 1918.11.30 |
 Bishop Ernst Karl Jakob Seydlformer Auxiliary Bishop of Wien (Austria) | 1918.09.30 | 1918.11.30 |
| Bishop Paweł Franciszek Kubicki former Auxiliary Bishop of Sandomierz (Poland) | 1918.07.29 | 1918.12.01 |
| Archbishop Pietro Mankowski former Bishop of Kamyanets-Podilskyi (Ukraine) | 1918.09.24 | 1918.12.01 |
| Blessed Archbishop Jurgis Matulaitis-Matulevicius, M.I.C. former Bishop of Vilnius (Lithuania) former Superior General of Congregation of Marian Fathers of the Immaculate Conception of the Blessed Virgin Mary (Marian Fathers) | 1918.10.23 | 1918.12.01 |
| Archbishop Arthur Jerome Drossaerts former Metropolitan Archbishop of San Antonio (USA) | 1918.07.18 | 1918.12.08 |
| Bishop Jules Benjamin Jeanmard former Bishop of Lafayette in Louisiana (USA) | 1918.07.18 | 1918.12.08 |
 Bishop Thomas Broderick, S.M.A.former Vicar Apostolic of Northern Nigeria (Nigeria) | 1918.08.24 | 1918.12.08 |
| Bishop Eduard Graf O’Rourke former Bishop of Gdańsk (Poland) | 1918.09.29 | 1918.12.15 |
