| A geophysical survey of Tullahogue Fort | Donnelly, Colm J.McHugh, RonanTrick, Steven | Article in Journal | | 2007 |
| A poem on Cenel Ennai | Boyle, Séamus | Article in Journal | | 1981 |
| A statistical survey of O'Neills (Neills and McNeills etc), Maguires and Crawfords in Northern Ireland, continued, 17th to 19th century | Montgomery, Roy | Article in Journal | | 1990 |
| A statistical survey of O'Neills, Maguires and Crawfords in Northern Ireland | Montgomery, Roy | Article in Journal | | 1990 |
| Abstracts of some Neale and O'Neill wills | Webb, C. R. | Article in Journal | | 1979 |
| An Leabhar Eoghanach : clabhsúr leabhar a mhuintire | O'Neill, Malachy | Article in Book | | 2010 |
| An Leabhar Eoghanach. An abridged edition in modern Irish|An Leabhar Eoghanach. An abridged translation of the Book of the descendants of Eoghan | Ó Néill, Malachy | Article in Journal | | 2011 |
| Broughderg and the O'Neill connection | Clarke, Sean | Article in Journal | | 2007 |
| Commemorating the anniversary of the Flight of the earls in Rathmullan | Ní Dhuibhne, Aine | Article in Journal | | 2007 |
| Conn O'Neill of Kilskeery | Ó Doibhlin, Éamon | Article in Journal | | 1967 |
| Don Bernardo O'Neill of Aughnacloy, Co. Tyrone | Walsh, Micheline Kerney | Article in Journal | | 1982 |
| Donegal and Antrim link: O'Neill and Chichester | Morgan, Fionn | Article in Journal | | 2007 |
| Dungiven's Cullen/O'Neill dynasty | Hasson, Seamus | Article in Journal | | 2013 |
| Excavations at Castle Hill, Dungannon, Co. Tyrone | Chapple, Robert M. | Article in Journal | | 2003 |
| Glencairn | Burke, Thomas A. | Article in Journal | | 2020 |
| History of the Parish of Tynan in the County of Armagh: with notices of the O'Neill, Hovenden, Stronge and other families connected with the district | Marshall, John J. | Monograph or Collective Volume | Tyrone Printing Co. | 1932 |
| Irish Gormlaith as a sovereignty figure | Trindade, W. Ann | Article in Journal | | 1986 |
| Johnsons - lineal descendants of Uí Néill | MacCarvill, Eileen | Article in Journal | | 1975 |
| Leabhar Cloinne Aodha Buidhe | | Monograph or Collective Volume | Oifig an tSoláthair thar Cionn Choimisiúin Láimhscríbhinní na hÉireann|Stationery Office for the Irish Manuscripts Commission | 1931 |
| Notes. The tombstone of Owen Roe O'Neill's grandson at Philippeville | Ferguson, Kenneth | Article in Journal | | 2018 |
| O'Dogarty addendum | Casway, Jerrold | Article in Journal | | 2007 |
| O'Neill : people and places | O'Neill, Seán | Monograph or Collective Volume | Ballinakella | 1991 |
| O'Neill : the origins of a dynasty | Moncrieffe, Ian, Sir | Article in Journal | | 1982 |
| O'Neill claimants in Dublin | Brady, John, d.1963 | Article in Journal | | 1942 |
| O'Neill's own country and its families | Ó Doibhlin, Éamon | Article in Journal | | 1971 |
| O'Neills in exile | Walsh, Micheline | Article in Journal | | 1976 |
| O'Neills in the dossiers of the personnel section of the General Military Archive of Segovia | Henry, Mark | Article in Journal | | 2013 |
| O'Neills in ths "Invalides" | Ó hAnnracháin, Eoghan | Article in Journal | | 2011 |
| Páistí theitheadh na nIarlaí. The children of the Flight | Bonner, Sean | Article in Journal | | 2006 |
| The archbishopric of Armagh and the O'Neills, 1347-1471 | Simms, Katharine | Article in Journal | | 1974 |
| The battle of Ballaghkillgevill, 1646 | Hollick, Clive | Article in Journal | | 1997 |
| The Battle of Swilly (Farsetmore), 8 May 1567 | Ó Brógáin, Tomás | Article in Journal | | 2011 |
| The castle of Castlereagh, Co. Down | McNeill, T. E. | Article in Journal | | 1987 |
| The connection between the Stuarts of Castlestuart and the O'Neills | King, R. G. S. | Article in Journal | | 1937 |
| The international gathering of the clan O'Neill (June 1991) and Hugo O'Neill's ancestry | Anonymous | Article in Journal | | 1989 |
| The O'Neill memorials at Donaghmore and Dundee | O'Neill, Pat | Article in Journal | | 2016 |
| The O'Neills in Spain | Walsh, Micheline | Monograph or Collective Volume | National University of Ireland | 1960 |
| The O'Neills of Glenariff | MacNeill, Máire | Article in Journal | | 1986 |
| The O'Neills of Leinster : an investigation into the origins of the O'Neills of Magh Da Chonn-Moyacomb - Leinster | O'Neill, Seán | Monograph or Collective Volume | Ulster Clans Centre | 1992 |
| The O'Neills of Nagh dá chonn | O'Neill, Seán | Article in Journal | | 1993 |
| The O'Neills of the Fews | Ó Fiaich, Tomás | Monograph or Collective Volume | Cumann Seanchais Árd Mhaca | 2003 |
| The O'Neills of the Fews: new findings concerning the historical O'Neill family and their present day lineage | Henry, Mark | Article in Journal | | 2013 |
| The O'Neills of Ulster : their history and genealogy. 3 vols. | Mathews, Thomas | Monograph or Collective Volume | | 1907 |
| The O’Neills of Magh da chonn | O'Neill, Seán | Article in Journal | | 1995 |
| The Vikings and the kingship of Tara | Jaski, Bart | Article in Journal | | 1995 |
| Tír Eoghain "north of the mountain" | Simms, Katharine | Article in Book | | 1999 |
| Tullaghoge and the O'Neill inaugural chair | Ó Néill, Seán | Article in Journal | | 1988 |