| Agallamh na Seanórach. 3 vols. | | Monograph or Collective Volume | | 1942 |
| Catalogue of Irish manuscripts in the National Library of Ireland : Fasciculus I : MSS G 1 - G 14 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | School of Celtic Studies, Dublin Institute for Advanced Studies | 1967 |
| Catalogue of Irish manuscripts in the National Library of Ireland : Fasciculus II : MSS G 15 - G 69 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1961 |
| Catalogue of Irish manuscripts in the National Library of Ireland : Fasciculus III. MSS G 70-G 114 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | School of Celtic Studies, Dublin Institute for Advanced Studies | 1977 |
| Catalogue of Irish manuscripts in the National Library of Ireland : Fasciculus IV. MSS G 115-G 160 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | School of Celtic Studies, Dublin Institute for Advanced Studies | 1977 |
| Catalogue of Irish manuscripts in the National Library of Ireland : Fasciculus V: MSS G 161-G 207 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1979 |
| Catalogue of Irish manuscripts in the National Library of Ireland. Fasciculus X : MSS G 434-G 500 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1987 |
| Catalogue of Irish manuscripts in the National Library of Ireland: Fasciculus IX: MSS G 374-G 433 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1986 |
| Catalogue of Irish manuscripts in the National Library of Ireland: Fasciculus VI: MSS G 208-G 257 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1980 |
| Catalogue of Irish manuscripts in the National Library of Ireland: Fasciculus VII: MSS G 258-G 330 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1982 |
| Catalogue of Irish manuscripts in the National Library of Ireland: Fasciculus VIII: MSS G 331-G 373 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1984 |
| Catalogue of Irish manuscripts in the National Library of Ireland: Fasciculus XII: MSS G 600-G 699 | Ní Shéaghdha, Nessa | Monograph or Collective Volume | School of Celtic Studies, Dublin Institute for Advanced Studies | 1990 |
| Catalogue of Irish manuscripts in the National Library of Ireland: Fasciculus XIII: MSS G 700-G 773 | Ní Shéaghdha, NessaÓ Macháin, Pádraig, | Monograph or Collective Volume | School of Celtic Studies, Dublin Institute for Advanced Studies | 1996 |
| Collectors of Irish manuscripts : motives and methods | Ní Shéaghdha, Nessa | Monograph or Collective Volume | Dublin Institute for Advanced Studies | 1986 |
| Collectors of Irish manuscripts : motives and methods | Ní Shéaghdha, Nessa | Article in Journal | | 1985 |
| Gairmeacha beatha roinnt scríobhaithe ón 18ú agus ón 19ú céad | Ní Shéaghdha, Nessa | Article in Journal | | 1990 |
| Irish scholars and scribes in eighteenth-century Dublin | Ní Shéaghdha, Nessa | Article in Journal | | 1989 |
| James Carney (Séamus Ó Ceithearnaigh) 1914-1989 | Ní Shéaghdha, Nessa | Article in Journal | | 1990 |
| John O’Mahony’s Irish hand. | Ní Shéaghdha, Nessa | Article in Book | | 1989 |
| Stair fhir-cheart ar Éirinn | | Monograph or Collective Volume | | 1941 |
| The poems of Blathmhac : the "fragmentary quatrains" | Ní Shéaghdha, Nessa | Article in Journal | | 1999 |
| Tóruigheacht Dhiarmada agus Ghráinne : the pursuit of Diarmaid and Gráinne | | Monograph or Collective Volume | Irish Texts Society | 1967 |