Population Usually Resident and Present in the State by Religion and Nationality, 2011
| Religion | Nationality | ||||||||||
| Irish | Non-Irish | UK | EU27 excluding Irish and UK | Other Europe | African | Asian | American | Other nationality | Not stated, including no nationality | All | |
| Roman Catholic | 3,525,573 | 282,799 | 49,761 | 184,066 | 2,222 | 9,770 | 19,420 | 13,706 | 3,854 | 22,815 | 3,831,187 |
| Church of Ireland, England, Anglican, Episcopalian | 93,056 | 30,464 | 21,477 | 4,228 | 174 | 2,571 | 783 | 628 | 603 | 925 | 124,445 |
| Muslim (Islamic) | 18,223 | 29,143 | 823 | 1,445 | 2,049 | 8,777 | 15,376 | 170 | 503 | 764 | 48,130 |
| Orthodox (Greek, Coptic, Russian) | 8,465 | 34,854 | 271 | 22,108 | 8,901 | 815 | 2,299 | 154 | 306 | 684 | 44,003 |
| Other Christian religion, n.e.s. | 24,023 | 15,258 | 2,112 | 3,165 | 300 | 5,506 | 2,556 | 1,325 | 294 | 371 | 39,652 |
| Presbyterian | 14,348 | 8,311 | 3,619 | 1,494 | 67 | 1,758 | 349 | 743 | 281 | 176 | 22,835 |
| Apostolic or Pentecostal | 5,520 | 8,182 | 183 | 2,320 | 37 | 5,013 | 364 | 166 | 99 | 174 | 13,876 |
| Other stated religions | 34,867 | 40,227 | 6,598 | 11,845 | 621 | 4,967 | 12,620 | 2,891 | 685 | 561 | 75,655 |
| No religion | 173,180 | 82,194 | 25,620 | 37,463 | 1,478 | 1,154 | 10,179 | 4,188 | 2,112 | 1,456 | 256,830 |
| Not stated | 29,888 | 12,925 | 1,795 | 6,371 | 458 | 1,311 | 1,633 | 913 | 444 | 25,855 | 68,668 |
| All religions | 3,927,143 | 544,357 | 112,259 | 274,505 | 16,307 | 41,642 | 65,579 | 24,884 | 9,181 | 53,781 | 4,525,281 |