Oberholser H. C., 1900: Catalogue of a collection of birds from Madagascar. 14 pp. 

 Oberholser H. C., 1900: Notes on birds collected by doctor W. L. Abbott in Central Asia. 24 pp. 

 Oberholser H. C., 1900: Notes on birds from the Cameroons district, West Africa. 9 pp. 

 Oberholser H. C., 1900: Notes on some birds from Santa Barbara Islands, California. 6 pp. 

 Oberholser H. C., 1902: Catalogue of a collection of hummingbirds from Ecuador and Colombia. 34 pp. 

 Oberholser H. C., 1903: List of birds collected by William T. Foster in Paraguay. 21 pp. 

 Oberholser H. C., 1903: Some new South American birds. 10 pp. 

 Oberholser H. C., 1904: A review of the wrens of the genus Troglodytes. 15 pp. 

 Oberholser H. C., 1904: A revision of the American great horned owls. 16 pp. 

 Oberholser H. C., 1904: Descriptions of a new african weaver-bird. 1 pp. 

 Oberholser H. C., 1906: Notes on birds from German and British East Africa. 11 pp. 

 Oberholser H. C., 1909: A revision of the kingfisher genus Ramphalcyon (Pelargopsis). 23 pp. 

 Oberholser H. C., 1911: A monograph of the flycatcher genera Hypothymis and Cyanonympha. 31 pp. 

 Oberholser H. C., 1911: A revision of the forms of the hairy woodpecker Dryobates villosus (Linnaeus). 28 pp. 

 Oberholser H. C., 1913: A revision of the forms of the great blue heron (Ardea herodias Linnaeus). 29 pp. 

 Oberholser H. C., 1915: A review of the subspecies of the ruddy kingfisher, Entomothera coromanda (Linnaeus). 19 pp. 

 Oberholser H. C., 1916: A synopsis of the races of the crested tern, Thalasseus bergii (Lichtenstein). 13 pp. 

 Oberholser H. C., 1916: Critical notes on the subspecies of the spotted owl, strix occidentalis (Xantus). 7 pp. 

 Oberholser H. C., 1917: The birds of Bawean Island, Java Sea. 16 pp. 

 Oberholser H. C., 1919: A review of the subspecies of the leach petrel, Oceanodroma leucorhoa (Vieillot). 8 pp. 

 Oberholser H. C., 1919: Birds collected by Dr. W. L. Abbott on various Islands in the Java Sea. 24 pp. 

 Oberholser H. C., 1920: Notes on the wrens of the genus Nannus Billberg. 14 pp. 

 Oberholser H. C., 1920: The birds of the Tambelan Islands, South China Sea. 15 pp. 

 Oberholser H. C., 1920: The races of the Nicobar megapode, Megapodius nicobariensis Blyth. 4 pp. 

 Oberholser H. C., 1925: Notes on birds collected by Dr. W. L. Abbott on the Karimata Islands, off West Borneo. 4 pp. 

 Obořil M., 2006: Studies on the ‘agriliform’ Anthaxia from Africa, with the descriptions of four new species (Coleoptera: Buprestidae). 12 pp. (in English). [M65] Acta entomologica Musei nationalis Pragae 46: 77-88.

 Obraztsov N. S., 1949: Eine neue Peronea Curt.-Art aus N. Syrien (Lepidoptera, Tortricidae. 3 pp. Mitteilungen der münchner entomologischen Gesellschaft 35-39: 224-225.

 Obraztsov N. S., 1949: Neue und wenig bekannte Tortriciden-Arten und Formen (Lep.). 13 pp. Mitteilungen der münchner entomologischen Gesellschaft 35-39: 198-210.

 Obraztsov N. S., 1949: Über die arabescana (Ev.) – Gruppe der Gattung Pseudeucosma Obr. (nebst Beschreibing einer neunen Art aus dem Kaukasus) (Lepidoptera, Tortricidae). 12 pp. Mitteilungen der münchner entomologischen Gesellschaft 35-39: 213-223.

 Obraztsov N. S., 1949: Zur Schwankung der Cornuti-Zahl bei Peronea hastiana (L.) (Lepidoptera, Tortricidae). 3 pp. Mitteilungen der münchner entomologischen Gesellschaft 35-39: 211-212.

 Obrtel R., 1948: Příspěvek k poznání cizopasných a býložravých blanokřídlých, (Tenthredionoidea, parsitic Hymenoptera). 20 pp. 

 Obrtel R., 1949: K otázce druhů rodu Pristomerus Curt. 5 pp. [HYM 2829] Folia entomologica 12: 102-106.

 Obrtel R., 1976: Soil surface harvestmen (Opilionidea) in a lowland forest. 34 pp. [M34] Acta Scientiarum Naturalium Academiae Scientiarium Bohemoslovacae Brno (N.S.) 10(12): 1-34.

 Obrtel R., Šedivý J., 1960: Hemiteles dodecellae n. sp. (Hym., Ichn.), a new parasite of the pine budworm. 3 pp. [M44] 

 Obrtel R., Šedivý J., 1960: Hemiteles dodecellae n. sp. (Hym., Ichn.), a new parasite of the pine budworm. 3 pp. [M44] [HYM 2830] Acta Societatis entomologicae Cechosloveniae 57: 143-145.

 Obuch J., 1994: Príspevok k pomernému zastúpeniu mikromammálií v Turci. 6 pp. 

 Ocana A., Brito A., Nunez J., 1992: A new species of Sarcodictyon (Anthozoa: Stolonifera) from Tenerife, Canry Islands. 6 pp. [EVE 543] Zoologische Mededelingen 66(31): 423-428.

 Ochs G., 1929: On some new and interesting sp. of water beetles of the family Gyrinidae in the United States National Museum. 6 pp. 

 Ochs G., 1937: Nachtrag zur Gyriniden-Fauna Javas und der benachbarten Sunda-Inseln nebst Beschreibung einiger Verwandten des Orectochilus spiniger Rég. aus Hinter-Indien und Ceylon. 10 pp. 

 Ochs G., 1967: Neue Gyriniden aus dem Museum G. Frey in Tutzing (Gyrinidae, Col.). 7 pp. Entomologische Arbeiten aus dem Museum G. Frey 18: 412-418.

 Oehlke J., 1964: Übersicht und Bestimmungstabelle der palaearktischen Gattungen der ehemaligen Unterfamilie Pimplinae auct. (Hymenoptera, Ichneumonidae). 58 pp. [M27] 

 Oezkan M., 1985: Hydrobaderia n. Gen., eine neue Hydryphatide-Gattung aus der Türkei (Acari, Actinedida, Hydrachnellae). 8 pp. [M17] 

 Oezkan, 1982: Wassermilben (Acari, Actinedida) aus der Türkei. 32 pp. [M16] 

 Offenberger M., Klarenberg A. J., 1997: Hymenopteran parasitoids of Drosophila breeding in decaying herbage (Diptera: Drosophilidae). 9 pp. [DIP 2448] Nachrichtenblatt der Bayerischen Entomologen 46(1/2): 11-19.

 Ofwegen L. P. van, 1989: On Wrightella coccinea (Ellis & Solander, 1786) and Wrightella stiasnyi spec. nov. (Anthozoa: Gorgonacea: Melithaeidae). 8 pp. Zoologische Mededelingen Leiden 63(3): 27-34.

 Ofwegen L. P. van, 1990: Notes on the Keroeididae (Anthozoa: Gorgonacea) collected in 1963 and 1964 by the international Indian ocean expedition of the r/v “Anton Bruun”, in the Indian ocean, with the description of a new species, Lignella hartogi. 6 pp. Zoologische Mededelingen Leiden 63(13): 163-168.

 Ofwegen L. P. van, 2008: The genus Sinularia (Octocorallia: Alcyonacea) at Palau, Micronesia. 105 pp. Zoologische Mededelingen 82: 631-735.

 Ofwegen L. P. van, 2008: The genus Sinularia (Octocorallia: Alcyonacea) from Bremer and West Woody islands (Gulf of Carpentaria, Australia). 35 pp. Zoologische Mededelingen 82: 131-165.

 Ofwegen L. P. van, Alderslade P., 2007: A new species of Alertigorgia (Coelenterata: Octocorallia: Anthothelidae) from the Indo Malayan region. 8 pp. Zoologische Mededelingen Leiden 81: 241-249.

 Ofwegen L. P. van, Benayahu Y., 1992: Notes on Alcyonacea (Octocorallia) from Tanzania. 16 pp. [EVE 546] Zoologische Mededelingen 66(6): 139-154.