| A cenotaph of 'Strongbow's' daughter at New Ross, Co. Wexford | Leask, H. G. (Harold G.) | Article in Journal | | 1948 |
| An altar tomb at Athassel Abbey, Co. Tipperary | Leask, H. G. (Harold G.) | Article in Journal | | 1946 |
| Ballymoon castle, Co. Carlow | Leask, H. G. (Harold G.) | Article in Journal | | 1944 |
| Bective abbey, Co. Meath | Leask, H. G. (Harold G.) | Article in Journal | | 1916 |
| Carved stones discovered at Kilteel, Co. Kildare | Leask, H. G. (Harold G.) | Article in Journal | | 1935 |
| Castles and their place in Irish history | Leask, H. G. (Harold G.) | Article in Journal | | 1971 |
| Castles and their place in Irish history | Leask, H. G. (Harold G.) | Article in Journal | | 1972 |
| Clara castle, Co. Kilkenny | Leask, H. G. (Harold G.) | Article in Journal | | 1937 |
| Derryhivenny castle, Co. Galway | Leask, H. G. (Harold G.) | Article in Journal | | 1938 |
| Donegal abbey : the buildings | Leask, H. G. (Harold G.) | Article in Book | | 1952 |
| Doorway and window, St. Augustine Street, Galway | Leask, H. G. (Harold G.) | Article in Journal | | 1939 |
| Early seventeenth-century houses in Ireland | Leask, H. G. (Harold G.) | Article in Book | | 1962 |
| Éire. Neithe ársa i bportachaibh nó i bhfeirmeachaibh Éireann; mar a haithnightear iad agus casd ba chóra a dhéanamh in a dtaobh, maille le halt ar ghnéithe de chuiltiur fo-luchta : treoir do lucht a bhfaghála | Leask, H. G. (Harold G.) | Monograph or Collective Volume | Department of Education | 1942 |
| Fore, Co. Westmeath : national monuments in the charge of the Commissioners of Public Works : St Fechin's church, the town gateways, and the Benedictine priory | Leask, H. G. (Harold G.) | Monograph or Collective Volume | Stationery Office | 1938 |
| Harold G. Leask : list of published works | Leask, H. G. (Harold G.) | Article in Journal | | 1966 |
| Historical and descriptive notes with illustrations of the ecclesiastical remains at Glendalough, Co. Wicklow | Commissioners of Public Works, IrelandLeask, H. G. (Harold G.) | Monograph or Collective Volume | The Stationery Office | 1937 |
| Irish architecture and sculpture in the early Christian epoch | Leask, H. G. (Harold G.) | Article in Book | | 1941 |
| Irish castles : 1180 to 1310 | Leask, H. G. (Harold G.) | Article in Journal | | 1937 |
| Irish castles and castellated houses | Leask, H. G. (Harold G.) | Monograph or Collective Volume | Dundalgan Press | 1941 |
| Irish churches and monastic buildings. 3 vols. | Leask, H. G. (Harold G.) | Monograph or Collective Volume | Dundalgan Press | 1955 |
| Irish Cistercian monasteries : a pedigree and distribution map | Leask, H. G. (Harold G.) | Article in Journal | | 1948 |
| Jerpoint Abbey, Co. Kilkenny | Leask, H. G. (Harold G.) | Monograph or Collective Volume | The Stationery Office | 1939 |
| Killeshin church and its Romanesque ornament | Crawford, H. S.Leask, H. G. (Harold G.) | Article in Journal | | 1925 |
| Killoughternane church, Co. Carlow | Leask, H. G. (Harold G.) | Article in Journal | | 1943 |
| King John's castle, Carlingford, Co. Louth | Leask, H. G. (Harold G.) | Monograph or Collective Volume | The Stationery Office | 1941 |
| Liathmore-Mochoemóg (Leigh), county Tipperary | Leask, H. G. (Harold G.)Macalister, R. A. S. (Robert Alexander Stewart) | Article in Journal | | 1946 |
| Liscarroll castle, Co. Cork | Leask, H. G. (Harold G.) | Article in Journal | | 1937 |
| Mallow castle, Co. Cork | Leask, H. G. (Harold G.) | Article in Journal | | 1944 |
| Medieval flooring tile from Greatconnell Abbey, Co. Kildare | Leask, H. G. (Harold G.) | Article in Journal | | 1942 |
| Mellifont abbey | Leask, H. G. (Harold G.) | Article in Journal | | 1947 |
| Monaincha, Co. Tipperary : historical and architectural notes | Leask, H. G. (Harold G.)McNeill, Charles | Article in Journal | | 1920 |
| Murrisk abbey, Co. Mayo | Leask, H. G. (Harold G.) | Article in Journal | | 1943 |
| Rahan, Offaly : the larger church | Leask, H. G. (Harold G.) | Article in Journal | | 1938 |
| Rathmacknee castle, county Wexford | Leask, H. G. (Harold G.) | Article in Journal | | 1953 |
| Rathmore Church, Co. Meath | Leask, H. G. (Harold G.) | Article in Journal | | 1933 |
| Redoubts occupied by the Royal Scots in Ireland in the 18th century | Leask, H. G. (Harold G.) | Article in Journal | | 1952 |
| Sarsfield's house, Kilmallock | Leask, H. G. (Harold G.) | Article in Journal | | 1941 |
| Some less known works of Edward Smyth, sculptor | Leask, H. G. (Harold G.) | Article in Journal | | 1950 |
| St Canice's cathedral, Kilkenny | Leask, H. G. (Harold G.) | Article in Journal | | 1949 |
| St Mochta's house, Louth | Leask, H. G. (Harold G.) | Article in Journal | | 1939 |
| St Patrick's Rock, Cashel, Co. Tipperary | Leask, H. G. (Harold G.) | Monograph or Collective Volume | | 1940 |
| Terryglass castle, Co. Tipperary | Leask, H. G. (Harold G.) | Article in Journal | | 1943 |
| The ancient walls of Limerick | Leask, H. G. (Harold G.) | Article in Journal | | 1941 |
| The architecture of the Cistercian order in Ireland in the 12th and early 13th centuries | Leask, H. G. (Harold G.) | Article in Journal | | 1939 |
| The Augustinian abbey of St Mary the Virgin, Cong, Co. Mayo | Leask, H. G. (Harold G.) | Article in Journal | | 1941 |
| The castle of Trim, Co. Meath | Leask, H. G. (Harold G.) | Article in Journal | | 1961 |
| The characteristic features of Irish architecture from early times to the twelfth century | Leask, H. G. (Harold G.) | Article in Journal | | 1936 |
| The church of St. Lua or Molua, Friar's Island near Killaloe | Leask, H. G. (Harold G.) | Article in Journal | | 1930 |
| The collegiate church of St Nicholas, Galway : a study of the structure | Leask, H. G. (Harold G.) | Article in Journal | | 1936 |
| The Franciscan friary, Nenagh, Co. Tipperary | Leask, H. G. (Harold G.) | Article in Journal | | 1938 |
| The friary of Muckross, commonly called 'Muckross Abbey' | Leask, H. G. (Harold G.) | Monograph or Collective Volume | The Stationery Office | 1941 |
| The mint, Carlingford | Leask, H. G. (Harold G.) | Article in Journal | | 1946 |
| Tullylease, Co. Cork : its church and monuments | Leask, H. G. (Harold G.) | Article in Journal | | 1938 |