| 70 years on | Casteleyn, Mary | Article in Journal | | 2006 |
| A history of literacy and libraries in Ireland | Casteleyn, Mary | Monograph or Collective Volume | Gower | 1984 |
| A memoir of some 19th century residents of Newcastle, county Limerick and its vicinity | Casteleyn, Mary | Article in Journal | | 2009 |
| Ada Bodart - forgotten Irish heroine of World War I | Casteleyn, Mary | Article in Journal | | 2015 |
| Anne Rosemary Chamney (16 April 1931-9 December 2008) | Casteleyn, Mary | Article in Journal | | 2009 |
| Archibald Fitzgerald of Dublin and Texas, grandson of the Irish patriot, Archibald Hamilton Rowan | Casteleyn, Mary | Article in Journal | | 2005 |
| Donations to the I.G.R.S. Library from the estate of the late Patrick Smythe-Wood | Casteleyn, Mary | Article in Journal | | 2001 |
| Finding Irish ancestors in Belgian records | Casteleyn, Mary | Article in Journal | | 2019 |
| Memorandum of the events of the married life of Mary Wills (née Sandford, later Wills-Sandford 1789-1851) of Castlerea Co. Roscommon | Casteleyn, Mary | Article in Journal | | 2010 |
| Mère Ambroisine (Ellen Clifford) of Skibbereen, County Cork, 1856-1939 | Casteleyn, Mary | Article in Journal | | 2017 |
| Newtown Jerpoint graveyard, Jerpoint, near Thomastown, County Kilkenny | Casteleyn, MaryKirwan, Bernadette | Article in Journal | | 2014 |
| Obituary : Michael Edward Basil Leader, 1915-1998 | Casteleyn, MaryKelly, Zita | Article in Journal | | 1998 |
| Rosemary ffolliott (24 September 1935-12 March 2009). A personal memoir | Casteleyn, Mary | Article in Journal | | 2009 |
| Sister Margaret Philomena Lonergan (11 May 1931 - 20 June 2008) | Casteleyn, Mary | Article in Journal | | 2009 |
| The family of McDermott of Dublin and Ramore, county Galway | Casteleyn, Mary | Article in Journal | | 2005 |
| The O'Briens of Fairfield, Co. Galway, the O'Brien relations of Florimond, Comte de Basteret | Casteleyn, Mary | Article in Journal | | 2004 |
| The origins of Count O'Sullivan, confidant of Leopold I, king of the Belgians and some other O'Sullivans in Belgium | Casteleyn, Mary | Article in Journal | | 2006 |
| The parish register and family history collections of the late Michael Leader | Casteleyn, Mary | Article in Journal | | 1999 |
| Tribute : Stawell St Ledger Heard | Casteleyn, Mary | Article in Journal | | 2015 |
| Tribute. George Chartres | Casteleyn, Mary | Article in Journal | | 2011 |
| Tribute. Professor Thomas Alexander Preston, 13 August 1927 - 28 December 2009 | Casteleyn, Mary | Article in Journal | | 2010 |