The cardinal electors in the 1939 papal conclave numbered 62 and all of them participated. They are arranged by region, and within each alphabetically.

1. Tommaso Boggiani, OP, Chancellor of Apostolic Chancery
2. Camillo Caccia-Dominioni, Prefect of Pontifical Household
3. Nicola Canali, Assessor of Holy Office
4. Federico Cattani Amadori, Secretary of Apostolic Signatura
5. Enrico Gasparri, Prefect of Apostolic Signatura
6. Pietro Fumasoni Biondi, Prefect of Propagation of the Faith
7. Gennaro Granito Pignatelli di Belmonte, Dean of the College of Cardinals
8. Domenico Jorio, Prefect of Discipline of the Sacraments
9. Vincenzo Lapuma, Prefect of Religious
10. Lorenzo Lauri, Major Penitentiary
11. Luigi Maglione, Prefect of Council
12. Domenico Mariani, Provost of the Administration of the Wealth of the Holy See
13. Giovanni Mercati, Librarian of Vatican Library, Archivist of Vatican Secret Archives
14. Eugenio Pacelli, Secretary of State, Camerlengo (was elected Pope and chose the name Pius XII)
15. Raffaele Rossi, OCD, Secretary of Consistorial
16. Carlo Salotti, Prefect of Rites
17. Donato Sbarretti, Secretary of Holy Office
18. Federico Tedeschini, Datary of His Holiness
19. Eugène-Gabriel-Gervais-Laurent Tisserant, Secretary of Oriental Churches (origin: France)
20. Alessandro Verde, Secretary of Rites

1. Alessio Ascalesi, CPPS, Archbishop of Naples
2. Pietro Boetto, SJ, Archbishop of Genoa
3. Elia Dalla Costa, Archbishop of Florence
4. Carlo Cremonesi, Territorial Prelate Emeritus of Pompei
5. Angelo Dolci, Archpriest of St. John Lateran Basilica
6. Maurilio Fossati, OSsCGN, Archbishop of Turin
7. Luigi Lavitrano, Archbishop of Palermo
8. Francesco Marchetti-Selvaggiani, Vicar General of Rome
9. Francesco Marmaggi, Nuncio to Poland
10. Massimo Massimi, President of Codification of Oriental Canon Law
11. Giovanni Nasalli Rocca di Corneliano, Archbishop of Bologna
12. Ermenegildo Pellegrinetti, Nuncio Emeritus to Yugoslavia
13. Adeodato Giovanni Piazza, OCD, Patriarch of Venice
14. Giuseppe Pizzardo, Secretary of Extraordinary Ecclesiastical Affairs
15. Alfredo Ildefonso Schuster, OSB, Archbishop of Milan
16. Enrico Sibilia, Nuncio to Austria

1. Alfred-Henri-Marie Baudrillart, IOSFN, Rector of Institut Catholique de Paris
2. Pierre-Marie Gerlier, Archbishop of Lyon
3. Achille Liénart, Bishop of Lille
4. Emmanuel Célestin Suhard, Archbishop of Reims
5. Jean Verdier, PSS, Archbishop of Paris

1. Adolf Bertram, Archbishop of Breslau
2. Michael von Faulhaber, Archbishop of Munich and Freising
3. Theodor Innitzer, Archbishop of Vienna
4. Karl Joseph Schulte, Archbishop of Cologne

1. Francisco Vidal y Barraquer, Archbishop of Tarragona
2. Isidro Goma y Tomas, Archbishop of Toledo
3. Pedro Segura y Sáenz, Archbishop of Seville

1. Jozef-Ernest van Roey, Archbishop of Mechelen

1. Karel Kašpar, Archbishop of Prague

1. Jusztinián György Serédi, OSB, Archbishop of Esztergom

1. August Hlond, SDB, Archbishop of Gniezno and Poznań

1. Manuel Gonçalves Cerejeira, Patriarch of Lisbon

1. Arthur Hinsley, Archbishop of Westminster (England, United Kingdom)
2. Joseph MacRory, Archbishop of Armagh (archdiocese contained territory in both Ireland/Éire and Northern Ireland)

1. Dennis Joseph Dougherty, Archbishop of Philadelphia
2. William Henry O'Connell, Archbishop of Boston
3. George Mundelein, Archbishop of Chicago

1. Jean-Marie-Rodrigue Villeneuve, OMI, Archbishop of Quebec

1. Santiago Copello, Archbishop of Buenos Aires

1. Sebastião da Silveira Cintra, Archbishop of Rio de Janeiro

1. Ignatius Gabriel I Tappuni, Patriarch of Antioch of the Syrians (Cardinal Tappuni was born in Mosul, located in modern-day Iraq)

• "The College of Cardinals" (PDF). New York Times. 19 February 1939. Retrieved 2 November 2017., with titles and photographs, in order of precedence