| Ad beatissimi Apostolorum Latin for 'To the Chair of the Prince of the Apostles' Encyclical of Pope Benedict XV | |
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| Signature date | 1 November 1914 |
| Subject | Appealing for peace |
| Number | 1 of 12 of the pontificate |
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Ad beatissimi Apostolorum is an encyclical of Pope Benedict XV given at St. Peter's, Rome, on the Feast of All Saints on November 1, 1914, in the first year of his pontificate. The first encyclical written by Pope Benedict XV coincided with the beginning of the First World War, which he labelled "the Suicide of Civilized Europe".