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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Donovan, J.E. | 1963 | Bittern, Botaurus stellaris, in Co Tipperary | Journal | Ir. Nat. J. | Details... |
| O'Flynn, W.J. | 1964 | Report on spoonbills at Ballymacoda, Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Halloran, J. | 2007 | Annual Review: Ornithology | Journal | Ir. Nat. J. | Details... |
| O'Halloran, J. & Smiddy, P. | 1994 | Cuckoos and their hosts in Ireland | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1930 | Garganey in Ireland - a correction | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1935 | Herring gull eating earthworms | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1935 | Robin and earwigs | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1937 | Magpie sunbathing | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1939 | Birds' nest beetles | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1940 | Turtle dove breeding in Ireland | Journal | Ir. Nat. J. | Details... |
| O'Mahony, J. | 1959 | Bar-tailed godwits summering in Ireland | Journal | Ir. Nat. J. | Details... |
| O'Mahony, J. | 1959 | Bar-tailed godwit numbers - a correction | Journal | Ir. Nat. J. | Details... |
| O'Meara, M. | 1975 | Building - nesting herring gulls (Larus argentatus Pontoppidan) in Co. Waterford | Journal | Ir. Nat. J. | Details... |
| O'Meara, M. & Forsyth, I. | 1978 | Corncrake breeding survey 1978 Ireland | Journal | Ir. Nat. J. | Details... |
| O'Murnaghan, A. | 1935 | The pied wagtail colony of Upper O'Connell Street, Dublin | Journal | Ir. Nat. J. | Details... |
| O'Neill, K.J. | 1944 | Young robins fed by male pied wagtail | Journal | Ir. Nat. J. | Details... |
| O'Regan, B. | 1950 | Black-winged stilt in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Regan, B. | 1950 | Leach's fork-tailed petrels in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Regan, B. | 1958 | Little egrets, Egretta garzetta, in Ireland in 1957 in Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Reilly, J.P. | 1894 | Flock of wild geese at Kingstown | Journal | Ir. Nat. | Details... |
2846 references found.