This article contains a list of encyclicals of Pope Pius IX. Pius IX issued 41 papal encyclicals during his reign as pope:
| No. | Title (Latin) | Title (English translation) | Subject | Date |
|---|---|---|---|---|
| 1. | Qui pluribus | On Faith and Religion | 9 November 1846 | |
| 2. | Praedecessores nostros | On Aid for Ireland | 25 March 1847 | |
| 3. | Ubi primum | On Discipline for Religious | 17 June 1847 | |
| 4. | In Suprema Petri Apostoli Sede | On the Supreme Throne of Peter the Apostle | On the relations with the Eastern Orthodox Churches | 6 January 1848 |
| 5. | Ubi primum | When First | On Immaculate Conception | 2 February 1849 |
| 6. | Nostis et nobiscum | You Know and with Us | On the Church in the Papal States | 8 December 1849 |
| 7. | Exultavit cor nostrum | Our Heart Rejoices | On the Effects of the Jubilee | 21 November 1851 |
| 8. | Ex Aliis Nostris | On the 1851 Jubilee | 21 November 1851 | |
| 9. | Nemo certe ignorat | On Discipline for Clergy | 25 March 1852 | |
| 10. | Probe noscitis Venerabiles | On the Discipline for Clergy | 17 May 1852 | |
| 11. | Inter multiplices | Pleading for Unity of Spirit | 21 March 1853 | |
| 12. | Neminem vestrum | On the Persecution of Armenians | 2 February 1854 | |
| 13. | Optime noscitis | On the Proposed Catholic University of Ireland | 20 March 1854 | |
| 14. | Apostolicae nostrae caritatis | Urging Prayers of Peace | 1 August 1854 | |
| 15. | Optime noscitis | On Episcopal Meetings | 5 November 1855 | |
| 16. | Singulari quidem | On the Church in Austria | 17 March 1856 | |
| 17. | Cum nuper | On Care for Clerics | 20 January 1858 | |
| 18. | Amantissimi Redemptoris | On Priests and the Care of Souls | 3 May 1858 | |
| 19. | Cum Sancta Mater Ecclesia | Pleading for Public Prayer | 27 April 1859 | |
| 20. | Qui nuper | On the Pontifical States | 18 June 1859 | |
| 21. | Nullis certe verbis | On the Need for Civil Sovereignty | 19 January 1860 | |
| 22. | Amantissimus | On the Care of the Churches | 8 April 1862 | |
| 23. | Quanto conficiamur moerore | On Promotion of False Doctrines | 10 August 1863 | |
| 24. | Incredibili | On the Persecution in New Granada | 17 September 1863 | |
| 25. | Ubi urbaniano | On the January Uprising in the Kingdom of Poland | 30 July 1864 | |
| 26. | Maximae quidem | On the Church in Bavaria | 18 August 1864 | |
| 27. | Quanta cura | Condemning Current Errors Appendix: Syllabus of Errors | 8 December 1864 | |
| 28. | Levate | On the Affiliations of Church | 27 October 1867 | |
| 29. | Respicientes | Protesting the Capture of Rome | 1 November 1870 | |
| 30. | Ubi Nos | "Our City" | On the Pontifical States | 15 May 1871 |
| 31. | Beneficia Dei | On the 25th Anniversary of His Pontificate | 4 June 1871 | |
| 32. | Saepe Venerabiles Fratres | Thanksgiving for 25 Years of Pontificate | 5 August 1871 | |
| 33. | Quartus supra | On the Church in Armenia | 6 January 1873 | |
| 34. | Etsi multa | On the Church in Italy, Germany and Switzerland | 21 November 1873 | |
| 35. | Vix dum a Nobis | On the Church in Austria | 7 March 1874 | |
| 36. | Omnem sollicitudinem | On the Greek-Ruthenian Rite | 13 May 1874 | |
| 37. | Gravibus Ecclesiae | Proclaiming A Jubilee | 24 December 1874 | |
| 38. | Quod nunquam | On the Church in Prussia | 5 February 1875 | |
| 39. | Graves ac diuturnae | On the Church in Switzerland | 23 March 1875 | |
| 40. | Exortae in ista | On the denunciation of the Freemasonry infiltrated among the Brazilian faithful | 20 April 1876 | |
| 41. | Quae in patriarchatu | On the situation of the Chaldean Catholic Church | 1 September 1876 |