Ofwegen L. P. van, Hermanlimianto M. I. Y. T., 2014: Siboga plexaurids (Coelenterata: Octocorallia) re-examined. 40 pp. Zoologische Mededelingen 88(1-4): 19-58.

 Ofwegen L. P. van, Vennam J., 1991: Notes on Octocorallia from the Laccadives (SW India). 12 pp. [EVE 547] Zoologische Mededelingen 65(9): 143-154.

 Ofwegen L. P. van, Vennam J., 1994: Results of the Rumphius biohistorical expedition to Ambon (1990). Part 3. The Alcyoniidae (Octocorallia: Alcyonacea). 24 pp. 

 Ogandžanjan A. M., 1959: Biologija Hyalomma asiaticum caucasicum B. Pom. v uslovijach Armjanskoj SSR. 46 pp. 

 Ogilby J. D., 1911: Descriptions of new or insufficiently described fishes from Queensland waters. 24 pp. 

 Ogloblin A. A., 1923: Two new Strepsipterar from materials of National Museum of Natural History in Prague. 3 pp. [AEP 01045] [M38] 

 Ogloblin A. A., 1924: Description of new species and notes on some Anteoninae (Proctotrupidae) of Czechoslovakia. 15 pp. [M44] 

 Ogloblin A. A., 1925: Descriptions of a new species of Pseudoisobrachium Kieff. (Hym. Bethylidae) from Brazil. 4 pp. [HYM 2845] Acta Societatis entomologicae Cechosloveniae 22: 24-27.

 Ogloblin A. A., 1925: Popisy tří nových druhů rodu Pseudoisobrachium Kieff. (Hym. Bethylidae) z Brazílie. 5 pp. [HYM 2846] Acta Societatis entomologicae Cechosloveniae 22: 77-81.

 Ogloblin A. A., 1925: Strepsiptera sbírek entomologického oddělení Národního musea v Praze. (II. pt.). 6 pp. Acta Entomologica Musei Nationalis Pragae 3: 171-176.

 Ogloblin A. A., 1925: Strepsiptera sbírek entomologického oddělení Národního musea v Praze. (II. pt.). 6 pp. [AEP 03171] [M38] 

 Ogloblin A. A., 1926: A new species of Allotropa (Scelionidae, Hymenoptera). 6 pp. Acta Entomologica Musei Nationalis Pragae 4: 145-150.

 Ogloblin A. A., 1926: Nová Strepsiptera sbírek Národního musea v Praze. (Part. III.). 11 pp. Acta Entomologica Musei Nationalis Pragae 4: 133-143.

 Ogloblin A. A., 1927: A new species of Loxotropa Foerst. (Hymen., Diapriidae) from Carpathian Russia in Czechoslovakia. 4 pp. Acta Entomologica Musei Nationalis Pragae 5: 115-117.

 Ogloblin D. A., 1927: Une espece nouvelle de genre Erystus Jac. (Col., Halticinae). 2 pp. Acta entomologica Musei nationalis Pragae 5: 119-120.

 Ohba S., Hidaka K., Sasaki M., 2006: Notes on paternal care and sibling cannibalism in the giant water bug, Lethocerus deyrolli (Heteroptera: Belostomatidae). 5 pp. Entomol. Sci. 9(1): 1-5.

 Ohguchi T., Tiba T., 1987: Neogene volcanism in the northern Honshu, Japan. Part 1. Historical change of volcanic fields. 11 pp. (in Japanese). Memoirs of the National Science Museum 20: 15-25 pp.

 Ohguchi T., Tiba T., 1987: Neogene volcanism in the northern Honshu, Japan. Part 2. Mode of occurrences of volcanic rocks along the north coast of the Tsugaru Peninsula. 9 pp. (in Japanese). Memoirs of the National Science Museum 20: 27-35.

 Ohira H., 1973: A list of the elaterid-beetles from South Asia preserved in the Hungarian Natural History Museum (Coleoptera). Part VII. 18 pp. [14186] Folia Entomologica Hungarica (S.N.) 26(suppl.): 317-334.

 Ohlin A., 1898: A zoologist in Tierra del Fuego: some account of the Swedish expedition, 1895-96. 10 pp. (in English). Natural Science 9(55): 172-181.

 Ohly J., 1985: Die Wasserbüffelwirtschaft am mittleren Amazonas aus der Sicht der jüngsten Entwicklungen. 17 pp. Amazoniana 9(3): 441-457.

 Oijen M. J. P. van, 2004: Haplochromis ushindi spec. nov., the largest piscivorous cichlid in the Mwanza Gulf area of Lake Victoria (East Africa) before the Nile perch upsurge. 6 pp. Zoologische Mededelingen Leiden 78: 249-255.

 Oijen M. J. P. van, Ligny W. de, 2006: Marinus Boeseman, 1916-2006, a biography and a list of his publications. 8 pp. Zoologische Mededelingen Leiden 80(4): 1-8.

 Oijen M. J. P. van, Roselaar C. S., 2007: Notes on types and early specimens of Bombycivora japonica von Siebold, 1824, and of Bombycilla phoenicoptera Temminck, 1828. 8 pp. Zoologische Mededelingen Leiden 81: 251-258.

 Oijen M. J. P. van, Zeeuw M. P. de, 2008: Haplochromis vonlinnei spec. nov., a piscivorous haplochromine cichlid (Teleostei, Perciformes) from the Mwanza Gulf area of Lake Victoria. 9 pp. Zoologische Mededelingen 82: 167-175.

 Oijen, 1992: Haplochromis howesi spec. nov., a crab and fish eating cichlid from Lake Victoria. 19 pp. [81177] Zoologische Mededelingen 66(40): 561-579.

 Oishi M., Yokota T., Teramoto N., Sato H., 2006: Japanese oak silkmoth feeding preference for and performance on upper-crown and lower-crown leaves. 9 pp.  Entomol. Sci. 9(1): 161-169.

 Oka A., 1922: A criticism on the present civilization. 26 pp. (in English). 

 Okada T., 1974: Drosophilidae (Diptera) from Korea. 7 pp. Ann. Hist.-nat. Mus. Nat. Hung. 66: 269-275.

 Okáli I., 1959: Ein Beitrag zur Kenntnis der Zikaden der Slowakei (Hom., Auchenorrhyncha). 1 p. [M46] 

 Okáli I., 1959: Ein Beitrag zur Kenntnis der Zikaden der Slowakei (Hom., Auchenorrhyncha). 1 p. [M46] [HEM 1128] Acta Societatis entomologicae Cechosloveniae 55: 109.

 Okáli I., 1983: Činnosť Slovenskej entomologickej spoločnosti pri SAV v rokoch 1977 až 1982. 12 pp. 

 Okáli I., 1986: List of the type specimens in the collections of the Slovak national museum – institute of natural history, Bratislava: Insecta, Diptera. 2 pp. 

 Okazawa T., 1975: Aquatic insect survey of the river Kaunnai, with special reference to the Rockey Chute Bed fauna. 16 pp. Kontyu, Tokyo 43(4): 497-512.

 Okely E. F., 1974: Description of the puparia of twenty-three British species of Sphaeroceridae (Diptera, Acalyptratae). 16 pp. 

 Okland F., 1932: Norske „halvinsekter“ (Protura). 7 pp. 

 Okland J., 1964: Om utbredelsen av vannskorpionen (Nepy cinerea L.) i Norge. 7 pp. 

 Okunev P., 1933: Noví ruští tesaříci (Col. Ceramb.). 2 pp. Acta entomologica Musei nationalis Pragae 11: 135-136.

 Oláh J., 1985: Three new Trichoptera from Korea. 6 pp. [TRI 143] Folia Entomologica Hungarica (S.N.) 46(1): 137-142.

 Oláh J., 1986: Four new Trichopterqa from Tanzania. 7 pp. [TRI 145] Folia Entomologica Hungarica (S.N.)47: 141-147.

 Oláh J., 1987: Record of Smicridea jamaicensis Flint from Cuba (Trichoptera: Hydropsychidae). 2 pp. Folia Entomologica Hungarica (S.N.) 48: 151-152.

 Oláh J., 1988: Eight new Agapetus from Vietnam (Trichoptera, Glossosomatidae). 10 pp. [TRI 148] Folia Entomologica Hungarica (S.N.) 49: 157-166.

 Oláh J., 1993: Seven new Trichoptera from the Gombak River system, Malaysia. 8 pp. [TRI 149] Folia Entomologica Hungarica (S.N.) 54: 93-100.

 Oldekop E., 1930: Über das Hierarchische Prinzip in der Natur und seine Beziehungen zum Mechanismus-Vitalismus-Problem. 64 pp. (in German). 

 Oldenberg L., 1901: Blepahrocera fasciata Westw. (Dipt.). 8 pp. 

 Oldenberg L., 1916: Einige Dolichopodiden meiner Ausbeute (Dipt.). 12 pp. 

 Oldenberg L., 1924: Zur Kenntnis der Asiliden-Gattung Lasiopogon (Diptera). 8 pp. [M15] [M40] 

 Oldenberg L., 1927: Anthomyza fasciipennis sp. n. (Dipt.). 3 pp. 

 Oldroyd H., 1937: Bombyliidae from Chile and Western Argentine (Part II). 11 pp. 

 Oldroyd H., 1949: Diptera. Introduction, and keys to families. 4 pp.