Papal conclave, 1378 Cardinal electors Cardinal electors

| Elector | Nationality | Cardinalatial_order_and_title | Elevated | Elevator |
|---|---|---|---|---|
| Hugues de Montelais, le jeune | French | Cardinal-priest of Ss. IV Coronati | 1375, December 20 | Gregory XI |
| Gui de Maillesec | French | Cardinal-priest of S. Croce in Gerusalemme | 1375, December 20 | Gregory XI |
| Pierre de Sortenac | French | Cardinal-priest of S. Lorenzo in Lucina | 1375, December 20 | Gregory XI |
| Gérard du Puy , O.S.B. | French | Cardinal-priest of S. Clemente | 1375, December 20 | Gregory XI |
| Giacomo Orsini | Roman | Cardinal-deacon of S. Giorgio in Velabro | 1371, May 30 | Gregory XI |
| Pierre Flandrin | French | Cardinal-deacon of S. Eustachio | 1371, May 30 | Gregory XI |
| Guillaume Noellet | French | Cardinal-deacon of S. Angelo in Pescheria | 1371, May 30 | Gregory XI |