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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Rourke, F.J. | 1957 | Bombus distinguendus Mor. one of the rarer Irish bumble bees | Journal | Ir. Nat. J. | Details... |
| O'Rourke, F.J. | 1957 | Notes on the zoology of the Dublin area | Journal | Ir. Nat. J. | Details... |
| O'Rourke, F.J. | 1964 | Ischnopsyllus intermedius (Rothschild), a bat flea new to Co. Cork | Journal | Ir. Nat. J. | Details... |
| O'Rourke, F.J. | 1969 | Tabanus bromius L., a bloodsucking fly new to Ireland with notes on the species of Tabanus recorded from Ireland | Journal | Ir. Nat. J. | Details... |
| Oehlke, J. | 1967 | Westpalaarktische Ichneumonidae. 1: Ephialtinae | Journal | Hymenopt. Cat. | Details... |
| Oldham, C. | 1933 | Painted lady and red admiral on the Mullet Peninsula | Journal | Ir. Nat. J. | Details... |
| Oldroyd, H. | 1964 | The natural history of flies | Book | | Details... |
| Oldroyd, H. | 1969 | Diptera: Brachycera, Tabanoidea & Asiloidea | Book | | Details... |
| Oliver, G.A. & Healy, B. | 1998 | Records of aquatic fauna from coastal lagoons in Ireland | Journal | Bull. Ir. biogeog. Soc. | Details... |
| Oosterbroek, P. | 2001 | On the presence of Tipula (Platytipula) luteipennis Meigen (Diptera: Tipulidae) in Ireland | Journal | Bull. Ir. biogeog. Soc. | Details... |
| Orr, H.K. | 1907 | Ornithomyia avicularia on starlings | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1899 | The dispersal of Mollusca etc. | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1900 | Insect notes from County Antrim | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1903 | Convolvulus hawk-moth near Belfast | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1909 | Hymenoptera from County Antrim and Down | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1909 | Hymenoptera in Ulster and Connaught | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1911 | Hymenoptera from Ulster | Journal | Ir. Nat. | Details... |
| Orr, H.L. | 1925 | Notes on aculeates in possession of W.F. Johnson | Unpublished | | Details... |
| Ossiannilsson, F. | 1983 | Auchenorhyncha (Homoptera) of Fennoscandia and Denmark. Part 3: the family Cicadellidae: Deltocephalinae, catalogue, literature and index | Journal | Fauna Entomol. Scand. | Details... |
| Owen, J. | 1997 | Heterocerus fenestratus (Thunberg) (Coleoptera), new to Ireland | Journal | Ir. Nat. J. | Details... |
4097 references found.