| Sacerdotii nostri primordia | |
| Language: | Latin |
| Translation: | From the beginning of our priesthood |
| Date: | 1 August 1959 |
| Pope: | John XXIII |
| Papal Coat Of Arms: | C o a John XXIII.svg |
| Number: | 2 of 8 |
| Before: | Ad Petri Cathedram |
| Web En: | https://www.vatican.va/holy_father/john_xxiii/encyclicals/documents/hf_j-xxiii_enc_19590801_sacerdotii_en.html |
| Web La: | https://web.archive.org/web/20190727005036/http://w2.vatican.va/content/john-xxiii/la/encyclicals/documents/hf_j-xxiii_enc_19590801_sacerdotii.html |
Sacerdotii nostri primordia ("From the beginning of our priesthood") was the second encyclical of Pope John XXIII, issued 1 August 1959. It commemorated the 100th anniversary of the death of St. John Vianney, the patron saint of priests.