| A Galway freedom box of 1771, with a note on corporate freedom | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1941 |
| A historic coat of arms | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| A history of Irish flags from earliest times | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | Academy Press | 1979 |
| A journey to Cork in 1798 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1950 |
| A military history of the 1916 Rising | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1969 |
| A relic of early Hanoverian rule in Galway | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1948 |
| A second sixteenth century Irish sword | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1948 |
| Ballyshannon : its strategic importance in the wars in Connacht, 1550–1602 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1931 |
| Ballyshannon. Its strategic importance in the wars in Connacht, 1550-1602 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1934 |
| Bratacha na hÉireann | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1945 |
| Captain Myles Walter Keogh, United States army 1840-1876 | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | National University of Ireland | 1966 |
| Castletown Yeomanry | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| Conciliation, coercion and the Protestant Reformation, 1547-71 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1976 |
| Contemporary maps as an aid to Irish history, 1593-1603 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1965 |
| Early references to the use of the pistol in Munster | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1942 |
| Gaelic society in Ireland in the late sixteenth century | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1963 |
| Historical studies, IV | | Monograph or Collective Volume | Bowes & Bowes | 1963 |
| Historical studies, X | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | Cló Chois Fharraige | 1976 |
| Index to The compossicion booke of Conought, 1585 | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | The Stationery Office [for the Irish Manuscripts Commission] | 1942 |
| Insurgent efforts towards military organisation, 1798 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1957 |
| Irish battles | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | Longmans | 1969 |
| Irish battles : a military history of Ireland | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | Appletree Press | 1988 |
| Irish defence policy, 1938-51 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1969 |
| Irish dress and Irish pictures | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1951 |
| Irish soldiers of the '45 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1967 |
| Irish volunteer formation in two ranks, 1784 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1950 |
| Limerick 1651 : the weapons of the siege | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1951 |
| Miles Byrne's yeomanry corps in 1798 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1948 |
| Militant Ireland | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1964 |
| O'Mellan's account of the battle of Benburb, 1646 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1947 |
| R. L. Stevenson and the Irish Question | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1950 |
| Robert Louis Stevenson and the Irish question | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1950 |
| Scots mercenary forces in Ireland (1565-1603) : an account of their service during that period, of the reaction of their activities on Scottish affairs, and of the effect of their presence in Ireland, together with an examination of the Gallóglaigh or Galloglas. With an introduction by Eoin MacNeill | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | Burns & Oates | 1937 |
| Sir John Davies in Cavan in 1606 and 1610 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1961 |
| Sir Walter Scott and Ireland | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1977 |
| Sixteenth century coast patrol | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1950 |
| Sixteenth century Irish swords in the National Museum of Ireland | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | | 1977 |
| Sixteenth century swords found in Ireland | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1948 |
| Strategy and tactics in Irish warfare, 1593-1601 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1941 |
| Strategy and tactics in Irish warfare, 1593-1601 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1940 |
| Strategy and tactics in later medieval Ireland : a general survey | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1942 |
| Tercentenary of Owen Roe O'Neill | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| The army of Ulster, 1593-1601 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| The Battle of Aughrim | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1942 |
| The battle of Benburb | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1964 |
| The battle of Clontibret, 1595 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| The battle of Kinsale, 1601 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| The battle of the Boyne | Hayes-McCoy, G. A. (Gerard Anthony) | Monograph or Collective Volume | Bórd Fáilte | 1958 |
| The Butler galloglas | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1969 |
| The completion of the Tudor conquest and the advance of the Counter-Reformation, 1571-1603 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1976 |
| The conduct of the Anglo-Irish war, 1919-1921 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1968 |
| The defence of Ireland a century ago | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1948 |
| The defence of the Moyry Pass, 1600 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1957 |
| The early history of guns in Ireland | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1938 |
| The first gun in Ireland | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1974 |
| The French campaign in Connacht and north Leinster 1798 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1980 |
| The gallóglach axe | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1936 |
| The Galway sword and mace | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1961 |
| The government forces which opposed the Irish insurgents of 1798 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1959 |
| The Hussar among the Fenians | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1952 |
| The insurgent threat to Dublin in 1798 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1958 |
| The Irish at war | | Monograph or Collective Volume | Mercier Press | 1964 |
| The Irish company in the Franco-Prussian war, 1870-71 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1953 |
| The Irish horse regiments of the eighteenth century | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1969 |
| The Irish national collection at the National Museum | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1942 |
| The Irish pike | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1942 |
| The Irish pike : additional notes on its history | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1944 |
| The MacDonalds of Mayo | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1936 |
| The making of an O'Neill | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1970 |
| The raising of the Connaught Rangers, 1793 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1945 |
| The red coat and the green | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1948 |
| The renaissance and the Irish wars | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1957 |
| The rising of 1916 in the background of Irish history | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1967 |
| The royal supremacy and ecclesiastical revolution, 1534-47 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1976 |
| The service of the Scottish mercenary forces in Ireland, from 1565 to 1603, with an account of the mercenary system in Ireland and of its effect on Scottish history | Hayes-McCoy, G. A. (Gerard Anthony) | Thesis | | |
| The significance of the siege of Clonmel | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1950 |
| The tide of victory and defeat, 1 : The battle of Clontibret, 1595; 2 : The battle of Kinsale, 1601 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| The topography of a battlefield : Arklow, 1798 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| The Tudor conquest (1534-1603) | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Book | | 1967 |
| The weapons of Benburb | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1945 |
| The Wexford Yeomanry and Miles Byrne | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1948 |
| Twenty-five years of Irish military history | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1975 |
| Two relics of the American civil war | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1951 |
| Ulster and other Irish maps, c.1600 | | Monograph or Collective Volume | Stationery Office for the Irish Manuscripts Commission | 1964 |
| Unpublished letters of King James V of Scotland relating to Ireland | | Article in Journal | | 1943 |