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| Papal conclave September 1823 | |
|---|---|
| Dates and location | |
| 2–28 September 1823 Quirinal Palace, Papal States | |
| Key officials | |
| Dean | Giulio Maria della Somaglia |
| Sub-dean | Bartolomeo Pacca |
| Camerlengo | Bartolomeo Pacca |
| Protopriest | Giuseppe Firrao |
| Protodeacon | Fabrizio Ruffo Dionigi |
| Election | |
| Vetoed | Antonio Gabriele Severoli |
| Elected pope | |
| Annibale della Genga Name taken: Leo XII | |
 | |
The papal conclave held from 2 to 28 September 1823 ended with the election of Annibale della Genga to succeed the death recently deceased Pius VII as pope. Della Genga took the name Leo XII.
Pius VII, who had been elected in 1800, had an unusually long pontificate, during which the Catholic Church had faced, in the French Revolution and its aftermath, a severe attack on its power and legitimacy. Pius himself had been a prisoner of Napoleon in France for six years.