| A fifteenth-century entrepreneur : Germyn Lynch, fl.1441-1483 | O'Neill, Timothy, 1947- | Article in Book | | 1988 |
| Aghaboe, c.600-1800 A.D. | O'Neill, Timothy, 1947- | Article in Journal | | 2004 |
| Book-making in early Christian Ireland | O'Neill, Timothy, 1947- | Article in Journal | | 1989 |
| Columba the scribe | O'Neill, Timothy, 1947- | Article in Book | | 1997 |
| Columcille: a royal and holy bookman of the sixth century | O'Neill, Timothy, 1947- | Monograph or Collective Volume | The Wild Apple Press | 2010 |
| Edmund MacRichard Butler: books and warfare in fifteenth-century Ireland | O'Neill, Timothy, 1947- | Monograph or Collective Volume | The Wild Apple Press | 2012 |
| Edmund MacRichard Butler: books and warfare in fifteenth-century Ireland | O'Neill, Timothy, 1947- | Article in Journal | | 2015 |
| From fax to vellum : producing manuscript books in the 21st century | O'Neill, Timothy, 1947- | Article in Book | | 2012 |
| Irish trade in the later middle ages: a survey | O'Neill, Timothy, 1947- | Thesis | | 1979 |
| Merchants and mariners in medieval Ireland | O'Neill, Timothy, 1947- | Monograph or Collective Volume | Irish Academic Press | 1987 |
| Overseas trade | Childs, Wendy R.O'Neill, Timothy, 1947- | Article in Book | | 1987 |
| Piracy off the southern and western coasts of Ireland in the later middle ages | O'Neill, Timothy, 1947- | Article in Journal | | 1980 |
| Psalms and psalm books | O'Neill, Timothy, 1947- | Article in Book | NA | 2013 |
| Quills, inks and vellums | O'Neill, Timothy, 1947- | Article in Book | | 2009 |
| Recently discovered fragments of an Irish double Gallicanum-Hebraicum psalter, probably ninth century | O'Neill, Timothy, 1947- ; McNamara, Martin | Article in Journal | | 2023 |
| St Gallen scripts | O'Neill, Timothy, 1947- | Article in Book | NA | 2025 |
| The Irish art of calligraphy : a step-by-step guide | O'Neill, Timothy, 1947- | Monograph or Collective Volume | Royal Irish Academy | 2024 |
| The Irish hand : scribes and their manuscripts from the earliest times | O'Neill, Timothy, 1947- | Monograph or Collective Volume | Cork University Press | 2014 |
| The Irish hand : scribes and their manuscripts from the earliest times to the seventeenth century with an exemplar of Irish scripts | O'Neill, Timothy, 1947- | Monograph or Collective Volume | Dolmen Press | 1984 |
| The lithographic manuscript facsimiles of the Royal Irish Academy | O'Neill, Timothy, 1947- | Article in Book | NA | 2018 |
| The Ó Longáins : last of the hereditary scribes of Ireland | O'Neill, Timothy, 1947- | Monograph or Collective Volume | Wild Apple Press | 2013 |
| The pen and the sword in ancient Ireland | O'Neill, Timothy, 1947- | Article in Journal | | 1999 |
| The Roscrea missal : the writing of a manuscript book | O'Neill, Timothy, 1947- | Article in Journal | | 1983 |
| Trade and shipping in the Irish sea in the later Middle Ages | O'Neill, Timothy, 1947- | Article in Book | | 1989 |