Saint Augustine Mortuary Chapel holds the first three bishops of the Cathedral and the 8th.
| bishops | starts | ends | burials |
| Patrick O’Reilly | 1870 | 1892 | burial |
| Thomas Beaven | 1892 | 1920 | burial |
| Thomas O’Leary | 1920 | 1949 | burial |
| Timothy McDonnell | 2004 | 2014 | burial |
