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| Papal conclave February–March 1829 | |
|---|---|
| Dates and location | |
| 24 February – 31 March 1829 Quirinal Palace, Papal States | |
| Key officials | |
| Dean | Giulio Maria della Somaglia |
| Sub-dean | Bartolomeo Pacca |
| Camerlengo | Pietro Francesco Galleffi |
| Protopriest | Giuseppe Firrao |
| Protodeacon | Giuseppe Albani |
| Election | |
| Candidates | Emmanuele de Gregorio, Bartolomeo Pacca |
| Vetoed | Bartolomeo Pacca |
| Elected pope | |
| Francesco Castiglioni Name taken: Pius VIII | |
 | |
The papal conclave held from 24 February to 31 March 1829 to elect a successor to the recently deceased Leo XII resulted in the accession of Cardinal Francesco Castiglioni, who took the name Pius VIII.
It took a long time for the conclave to elect a new pope due to conflict between secular governments concerning who should be elected. Cardinal Emmanuele De Gregorio was the proposed candidate of the pro-French faction and the zelanti (conservative cardinals), whilst Cardinal Bartolomeo Pacca was proposed by the more moderate cardinals but was not accepted by the French government of the Bourbon Restoration period, headed by King Charles X and Prime Minister Jean Baptiste Gay, vicomte de Martignac. Pacca was also seen by many in the conclave as being too gentle to be an effective pope.