| Quod iam diu | |
| Language: | Latin |
| Translation: | That which has long been |
| Argument: | On the future peace conference |
| Date: | 1 December 1918 |
| Type: | encyclical |
| Pope: | Benedict XV |
| Papal Coat Of Arms: | C o a Benedictus XV.svg |
| Number: | 3 of 12 |
| Before: | Humani generis redemptionem |
| After: | In hac tanta |
| Web En: | https://web.archive.org/web/20080219144812/http://www.vatican.va/holy_father/benedict_xv/encyclicals/documents/hf_ben-xv_enc_01121918_quod-iam-diu_en.html |
| Web La: | https://web.archive.org/web/20130302231816/http://www.vatican.va/holy_father/benedict_xv/encyclicals/documents/hf_ben-xv_enc_01121918_quod-iam-diu_lt.html |
Quod iam diu was an encyclical of Pope Benedict XV, given at Rome at St. Peter's on December 1, 1918, the fifth year of his Pontificate. It requests all Catholics everywhere in the world, no matter which side they were on, to pray for a lasting peace and for those who are entrusted to make it during the peace negotiations.
The Pope notes that true, peace has not yet arrived but the Armistice has suspended the slaughter and devastation by land, sea and air. 1 It is now the obligation of all Catholics on all sides to invoke Divine assistance for all who take part in the peace conference.[1] The delegates who are to meet to define peace need all the support they can get for their search of a lasting peace.