| 12336 | Gilbert Library (Dublin City Library) | Ms203 | 1785 | Letter from Charles O'Connor to Joseph Cooper Wa... | Gilbert Collection, Charles O'Connor, letters and correspondence |
| 1502 | National Library of Ireland | Ms2035 | 1848 | 'The priest perils; a true story of Irish life' and ... | |
| 10765 | National Library of Ireland | Ms20304 | c1765-1842 | Letters to Charles O'Hara from members of the Trench... | O'Hara Papers |
| 10766 | National Library of Ireland | Ms20310 | c1805-1844 | Letters to Charles King O'Hara in his capacity of ma... | O'Hara Papers |
| 10767 | National Library of Ireland | Ms20333 | 1831 | Letter to Charles King O'Hara from Ann O'Connor, Coo... | O'Hara Papers |
| 10768 | National Library of Ireland | Ms20343 | 1825 | Letter to Charles King O'Hara from Thomas Turner, Go... | O'Hara Papers |
| 10769 | National Library of Ireland | Ms20359 | | Letter to Rose Lady Peyton in Dublin from her cousin... | O'Hara Papers |
| 10770 | National Library of Ireland | Ms20364 | c1750 | Letter to Elizabeth Countess of Hyndford from Lady M... | O'Hara Papers |
| 10771 | National Library of Ireland | Ms20366 | c1799-1805 | Thirty letters to Margaret O'Hara from Anne Venables... | O'Hara Papers |
| 10772 | National Library of Ireland | Ms20371 | | Includes letter of Myles John O'Reilly, Dublin to Mr... | O'Hara Papers |
| 10773 | National Library of Ireland | Ms20375 | 1843 | Letter to Charlotte Streatfield, mostly relating to ... | O'Hara Papers |
| 10774 | National Library of Ireland | Ms20378 | 1870-1894 | Seventeen letters, mostly to Messrs Tweedy, Solicito... | O'Hara Papers |
| 10775 | National Library of Ireland | Ms20379 | 1870-1872 | Letters to Annie Charlotte O'Hara from persons seeki... | O'Hara Papers |
| 10780 | National Library of Ireland | Ms20389 | [1775-1778] | Thirty unsigned and unaddressed letters from Charles... | O'Hara Papers |