| "Marks of unheeded dilapidation" : the nineteenth and early twentieth century restorations | O'Neill, Michael | Monograph or Collective Volume | St Patrick's Cathedral | 1991 |
| 'Faith to the king, constancy in religion, and preservation of the Commonwealth' : The reactions of Connacht based members of the Old English community to the outbreak of unrest in Ireland in October 1641 | Duignan, Aoife | Article in Book | University College Dublin Press | 2004 |
| 'For the preservation of the slate' : Irish domestic security, legislation, 1939-40 | O'Neill, Michael S. | Article in Journal | | 2002 |
| A visual window on the church's past : the RCBL's architectural drawings digitising project | O'Neill, Michael | Article in Journal | | 2014 |
| An architectural history of the Church of Ireland | O'Neill, Michael | Monograph or Collective Volume | Church of Ireland Publishing | 2022 |
| An introduction to Joseph Holloway | Hogan, RobertO'Neill, Michael | Article in Journal | | 1964 |
| Architecture from the Reformation to 1800 | O'Neill, Michael | Article in Book | | 2009 |
| Bank architecture in Dublin : a history to c. 1940 | O'Neill, Michael | Monograph or Collective Volume | Dublin City Council|Four Courts Press | 2012 |
| Belfast Cathedral | O'Neill, MichaelRankin, Fred | Article in Book | | 2013 |
| Cavan's towns and villages from the Plantation to the twentieth century | O'Neill, Michael | Article in Book | | 2014 |
| Christ Church cathedral and its environs : medieval and beyond | O'Neill, Michael | Article in Book | | 2011 |
| Christ Church cathedral as a blueprint for other Augustinian buildings in Ireland | O'Neill, Michael | Article in Book | | 2009 |
| Church of Ireland parish and church in the diocese of Meath in the eighteenth and nineteenth centuries | O'Neill, Michael | Article in Book | | 2015 |
| Contemporary Northern Irish poets and romantic poetry | O'Neill, Michael | Article in Book | | 2003 |
| Dublin Castle : From Fortress to Palace. Volume 1: Vikings to Victorians. A history of Dublin Castle to 1850. | Duffy, Seán ; Montague, John ; Mulligan, Kevin ; O'Neill, Michael | Monograph or Collective Volume | National Monuments Service | 2022 |
| History matters | | Monograph or Collective Volume | University College Dublin | 2004 |
| Irish Franciscan friary architecture : late medieval and early modern | O'Neill, Michael | Article in Book | | 2009 |
| Joseph Holloway's Abbey Theatre : a selection from his unpublished journal 'Impressions of a Dublin playgoer' | Hogan, RobertHolloway, JosephO'Neill, Michael | Monograph or Collective Volume | Illinois University Press | 1967 |
| Lennox Robinson | O'Neill, Michael | Monograph or Collective Volume | Twayne | 1964 |
| Miscellanea. 'Pray God send all well!' References to Ireland in the Diaries of Samuel Pepys, 1659-69 | O'Neill, Michael | Article in Journal | | 2013 |
| Miscellanea. Kilfenora Cathedral | O'Neill, Michael | Article in Journal | | 2013 |
| Nineteenth-century architectural restorations | O'Neill, Michael | Article in Book | | 2009 |
| St Patrick's cathedral (C. of I.) | O'Neill, MichaelStalley, Roger | Article in Book | | 2005 |
| St Patrick's cathedral, Dublin and its prebendal churches : gothic architectural relationships | O'Neill, Michael | Article in Book | | 2004 |
| St. Werburgh's Church | O'Neill, Michael | Article in Journal | | 2012 |
| The architectural history of the medieval cathedral | O'Neill, Michael | Article in Book | | 2009 |
| The architecture of St Patrick’s cathedral, Dublin | O'Neill, Michael | Article in Journal | | 1995 |
| The architecture of the Church of Ireland | O'Neill, Michael | Article in Book | | 2013 |
| The first aeroplane in Tuam | Laheen, Maurice J.O'Neill, Michael | Article in Journal | | 2004 |
| The mason's tale | O'Neill, Michael | Article in Book | | 2014 |
| The medieval churches and Old Leighlin cathedral in County Carlow | O'Neill, Michael | Article in Book | | 2008 |
| The medieval parish churches in county Meath | O'Neill, Michael | Article in Journal | | 2002 |
| The medieval parish churches of county Kildare | O'Neill, Michael | Article in Journal | | 2004 |
| The medieval parish churches of County Kildare | O'Neill, Michael | Article in Book | | 2006 |
| The organisation of the Irish army 1939-45 : an overview | O'Neill, Michael S. | Article in Book | | 2004 |
| The organisation of the Irish Army 1939-45: an overview | O'Neill, Michael S. | Article in Journal | | 2004 |
| The restructuring of educational provision in Ireland in the 1960s | O'Neill, Michael S. | Article in Journal | | 2001 |
| With God's assistance. On the 150th anniversary of its completion, Michael O'Neill traces key chapters in the Pakenham-Guinness restoration of St Patrick's Cathedral 1845-1865 | O'Neill, Michael | Article in Journal | | 2015 |
| Young hurler hurt as garage floor collapses | Laheen, Maurice J.O'Neill, Michael | Article in Journal | | 2004 |