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| Author(s) [A-Z] | Year [ascending] | Title | Type | Journal | Citation |
| O'Brien, R.D. | 1909 | Freshwater crayfish in Munster and Ulster | Journal | Ir. Nat. | Details... |
| O'Connor, J.P. | 1978 | The stonefly Capnia atra Morton (Plecoptera: Capniidae) confirmed as an Irish species | Journal | Ent. Gaz. | Details... |
| O'Connor, J.P. | 1984 | Notes on planktonic Crustacea and Hydracarina from two Irish lakes | Journal | Bull. Ir. biogeog. Soc. | Details... |
| O'Connor, J.P. | 1990 | Review: 'The natural history of lakes' by Burgis & Morris | Journal | Ir. Nat. J. | Details... |
| O'Connor, J.P. | 1990 | Review: 'Adults of the British aquatic Hemiptera Heteroptera: a key with ecological notes' by A.A. Savage | Journal | Ir. Nat. J. | Details... |
| O'Connor, J.P. | 1997 | Review: 'British freshwater Megaloptera and Neuroptera: a key with ecological notes' by J.M. Elliott | Journal | Ir. Nat. J. | Details... |
| O'Connor, J.P. | 1999 | Review: 'Last-instar larvae and pupae of the Simuliidae of Britain and Ireland' by J. Bass | Journal | Ir. Nat. J. | Details... |
| O'Connor, J.P. & Norton, M.A. | 1977 | Athlone Field Meeting preliminary notes on the aquatic invertebrate fauna of Hare Island and environs | Journal | Bull. Ir. biogeog. Soc. | Details... |
| O'Connor, J.P. & Norton, M.A. | 1978 | Further notes on the aquatic invertebrates of Hare Island and its environs, Lough Ree, Co. Westmeath | Journal | Bull. Ir. biogeog. Soc. | Details... |
| O'Connor, J.P. & Wise, E.J. | 2004 | Observations on the Trichoptera of the rivers Flesk and Laune, Kilarney, Co. Kerry, Ireland | Journal | Bull. Ir. biogeog. Soc. | Details... |
| O'Connor, W.C.K. | 1997 | A freeze sampling assessment of spawning gravel siltation in the River Bush, Co. Antrim | Journal | Ir. Nat. J. | Details... |
| O'Grady, M.F. | 1983 | A unusual habitat for the stone loach (Noemacheilus barbatulus L.) | Journal | Ir. Nat. J. | Details... |
| O'Grady, M.F. | 1983 | Mature wild brown trout in August | Journal | Ir. Nat. J. | Details... |
| O'Grady, M.F. & King, J.J. | 1992 | Ecological changes over 30 years caused by drainage of a salmonid stream, the Bunree River | Journal | Ir. Fish. Invest. | Details... |
| O'Grady, M.F., O'Connor, J.P. & Champ, W.S.T. | 1979 | Preliminary notes on Irish lake Oligochaeta | Journal | Ir. Nat. J. | Details... |
| O'Hanlon, R.P. & Bolger, T. | 1994 | The current status of Arcitalitrus dorrieni (Crustacea: Amphipoda: Talitridae) in Ireland | Journal | Ir. Nat. J. | Details... |
| O'Mahony, E. | 1929 | Report on recent additions to the Irish fauna and flora (terrestrial and freshwater). Coleoptera | Journal | Proc. Roy. Ir. Acad. | Details... |
| O'Meara, E. | 1875 | Report on the Irish Diatomacea | Journal | Proc. Roy. Ir. Acad. | Details... |
| O'Meara, E. | 1878 | List of Diatomaceae found in the counties of Dublin and Wicklow | Journal | Sci. Proc. R. D. S. | Details... |
| O'Riordan, C.E. | 1982 | Review: 'Collins handguide to the fishes of Britain and Europe' by J. Nicholls & P. Miller | Journal | Ir. Nat. J. | Details... |
956 references found.