| Month: | October–November |
| Year: | 1389 |
| Dates: | 25 October – 2 November 1389 |
| Location: | Apostolic Palace, Papal States |
| Dean: | Francesco Moricotti Prignani |
| Camerlengo: | Marino Bulcani |
| Protodeacon: | Tommaso Orsini dei Conti di Manupello |
| Pope Elected: | Pietro Tomacelli |
| Nametaken: | Boniface IX |
| Prevconclave Year: | 1378 |
| Prevconclave Link: | 1378 papal conclave |
| Nextconclave Year: | 1404 |
| Nextconclave Link: | 1404 papal conclave |
The 1389 papal conclave (25 October – 2 November) was convoked after the death of Pope Urban VI. The conclave is historically unique because all of the cardinal electors were the creation of a single pontiff: Urban VI, the very pope who was being replaced. None of the surviving cardinals created by previous popes recognized Urban VI as legitimate (see: Western Schism). In addition, Urban VI had deposed four of his creatures, and three were absent, leaving only sixteen cardinal electors.[1]
| Elector | Nationality | Order | Title | Elevated | Elevator | Notes | |
|---|---|---|---|---|---|---|---|
| Francesco Moricotti Prignani | Cardinal-bishop | Bishop of Palestrina | 18 September 1378 | Urban VI | Dean of the Sacred College of Cardinals | ||
| Andrea Bontempi Martini | Cardinal-priest | Titulus Ss. Marcellino e Pietro | 18 September 1378 | Urban VI | Cardinal primoprete; administrator of the see of Perugia; legate in Picenum | ||
| Poncello Orsini | Cardinal-priest | Titulus S. Clemente | 18 September 1378 | Urban VI | |||
| Pietro Tomacelli | Neapolitan | Cardinal-priest | Titulus S. Anastasia | 21 December 1381 | Urban VI | Archpriest of the patriarchal Lateran Basilica; Elected Pope Boniface IX | |
| Angelo Acciaioli | Florentine | Cardinal-priest | Titulus S. Lorenzo in Damaso. | 17 December 1384 | Urban VI | ||
| Francesco Carbone Tomacelli, O.Cist. | Cardinal-priest | Titulus S. Susanna | 17 December 1384 | Urban VI | Grand penitentiary | ||
| Stefano Palosio | Cardinal-priest | Titulus S. Marcello. | 17 December 1384 | Urban VI | Administrator of the see of Todi | ||
| Tommaso Orsini dei Conti di Manupello | Cardinal-deacon | Deacon of S. Maria in Domnica | Circa 1383 - 1379 | Urban VI | Protodeacon | ||
| Francesco Renzio | Cardinal-deacon | Deacon of S. Eustachio | 21 December 1381 | Urban VI | Camerlengo of the Sacred College of Cardinals | ||
| Marino Bulcani | Cardinal-deacon | Deacon of S. Maria Nuova. | 17 December 1384 | Urban VI | Camerlengo of the Holy Roman Church
| ||
| Rinaldo Brancaccio | Cardinal-deacon | Deacon of Ss. Vito e Modesto | 17 December 1384 | Urban VI | |||
| Ludovico Fieschi | Cardinal-deacon | Deacon of S. Adriano | 17 December 1384 | Urban VI | Administrator of the see of Vercelli; Vicar General of the States of the Church | ||
| Angelo d'Anna de Sommariva, O.Camald. | Cardinal-deacon | Deacon of S. Lucia in Septisolio | 17 December 1384 | Urban VI |
| Elector | Nationality | Order | Title | Elevated | Elevator | Notes | |
|---|---|---|---|---|---|---|---|
| Philippe of Alençon | French | Cardinal-bishop | Bishop of Ostia e Velletri | 18 September 1378 | Urban VI | Archpriest of the patriarchal Vatican Basilica | |
| Adam Easton, O.S.B. | English | Cardinal-priest | Titulus S. Cecilia | 21 December 1381 | Urban VI | He was deprived of cardinalate by Urban VI in 1385 and was not considered a valid elector in October 1389 (he was reinstated in December of that year)[2] | |
| Valentin d'Alsan | Hungarian | Cardinal-priest | Titulus Ss. IV Coronati (or S. Sabina) | 17 December 1384 | Urban VI | Administrator of the see of Pécs |