| Ad Apostolorum principis Latin for 'At the Prince of the Apostles' Encyclical of Pope Pius XII | |
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| Signature date | 29 June 1958 |
| Subject | On Communism and the Church in China |
| Number | 40 of 41 of the pontificate |
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Ad Apostolorum principis (29 June 1958) is an encyclical of Pope Pius XII on Communism and the Church in China. It describes systematic persecutions of bishops, priests, religious and faithful and the attempts of the government to establish a patriotic Catholic Church, independent of Rome.