1958 Conclave
elected John XXIII25–28 October 1958 · The modern conclaves · Sistine Chapel, Apostolic Palace, Vatican City
A conclave was held from 25 to 28 October 1958 to elect a pope to succeed Pius XII, who had died on 9 October 1958. Of the 53 members of the College of Cardinals, all but two attended.
Elected pope
John XXIII
Angelo Roncalli
Succeeded
Pius XII
Duration
4 days
11 ballots
Cardinal electors
51
locked in under conclave rules
Key officials
| Dean | Eugène Tisserant |
| Camerlengo | Benedetto Aloisi Masella |
Ballot-by-ballot tallies are destroyed by design — the paper is burned in the stove whose smoke announces the result — so this entry records what the Church documents: the dates, the electors, the number of ballots where known, and the man who walked out onto the balcony.