Osten Sacken C. R., 1886: Characters of the larvae of Mycetophilidae. 30 pp. 

 Osten Sacken C. R., 1887: On Mr. Portchinski’s publications on the larvae of Muscida including a detailed abstract of his last paper: Comparative biology of the necrophagous and coprophagous larvae. 11 pp. 

 Osten Sacken C. R., 1887: Some North American Tachinae. 6 pp. 

 Osten Sacken C. R., 1887: Studies on Tipulidae. Part II. Review of the published genera of the Tipulidae brevipalpi. 80 pp. 

 Osten Sacken C. R., 1890: Hilarimorpha Schin. ins a Leptid. 2 pp. 

 Osten Sacken C. R., 1891: Synopsis of the described genera and species of the Blepharoceridae. 10 pp. 

 Osten Sacken C. R., 1893: Explanatory notice of my views on the sub-orders of Diptera. 2 pp. 

 Osten Sacken C. R., 1894: On the atavic index-characters with some remarks about the classification of the Diptera. 8 pp. 

 Osten Sacken C. R., 1894: On the New Zealand Dipterous fauna. 4 pp. 

 Osten Sacken C. R., 1895: Contributions to the study of Liponeuridae Loew (Blepharoceridae Loew, olim). 17 pp. 

 Osten Sacken C. R., 1895: Eristalis tenax in chinese and japanese literature. 28 pp. 

 Osten Sacken C. R., 1895: XIX. Remarks on the homologies and differnces between the first stages of Pericoma, Hal., and those of the new Brazilian species. 5 pp. 

 Osten Sacken C. R., 1896: A new genus of Cyrtidae (Dipt.) from New Zealand. 3 pp. 

 Osten Sacken C. R., 1896: Bibiliograhische und theilweise psychologische Untersuchung übe die zwei Ausgaben der Erstlingsarbeit von H. Loew: Ueber die Posener Dipteren. 6 pp. 

 Osten Sacken C. R., 1896: Notice on the terms tegula, antitegula, squama and alula, as used in Dipterology. 4 pp. 

 Osten Sacken C. R., 1897: Identification of two genera of Nemestrinidae. 7 pp. 

 Osten Sacken C. R., 1900: Notice on the synonymy of Anopheles maculipennis, Meigen. 2 pp. 

 Osten Sacken C. R., 1902: The position of Phora in the system of Diptera. 2 pp. 

 Osten Sacken C. R., : Report on the Diptera collected by Lieut. W. L. Carpenter in Colorado during the summer of 1873. 6 pp. 

 Ostroverchova G. P., 1982: Zoogeografičeskaja charakteristika fauny micetofiloidnych komarov Zapadnoj Sibiri. 5 pp. 

 Otter G. W. M. A., 1938: On the morphology of the larvae of three species of Cecidomyidae (Diptera) from knapweed (Centaurea) flowers. 30 pp. The Transactions of the Royal Entomological Society of London 87(2): 39-68.

 Otter G. W., 1934: On the early stage of Lestopdiplosis alvei Barnes (Diptera, Cecidomyidae), especially in relation to the larval head capsule. 12 pp. 

 Otto C.-J., Schiegg K., 1999: Chironomidae (Diptera) collected in the forest reserve Sihlwald ZH, with 21 new records for Switzerland. 9 pp. Mitt. Schweiz. entomol. Ges. 72(1-2): 95-103.

 Ouchi Y., 1938: Diptera Sinica. Cyrtidae (Acroceridae) I. On some cyrtid flies from Eastern China and a new species from Formosa. 4 pp. 

 Ouchi Y., 1938: Diptera Sinica. Muscidae-Eginiinae. I. A new Eginiid fly from Eastern China. 5 pp. 

 Ouchi Y., 1938: Diptera Sinica. Muscide-Phaoniinae. Notes on some flies of genus Fannia from Eastern China. 4 pp. 

 Ouchi Y., 1939: Contributiones ad cognitionem insectorum Asiae orientalis. VI. On some conopid flies from the Japanese proper and certain parts of the southern Japan. 7 pp. 

 Ouchi Y., 1939: Contributiones ad cognitionem insectorum Asiae orientalis. VII. A new species of Megarhinus mosquito from Amami-Oshima, the southern Japan. 4 pp. 

 Ouchi Y., 1939: Diptera Sinica. Celyphidae. I. On a new species of genus Spaeniocelyphus from Eastern China. 3 pp. 

 Ouchi Y., 1939: Diptera Sinica. Muscidae - Muscinae. III. A new species described from Eastern China and an additional record from Northern China, Manchoukuo, Northern Corea on gen. Graphomyia, Muscinae, Muscidae. 5 pp. 

 Ouchi Y., 1939: Diptera Sinica. Oestridae. I. On a new genus belonging to subfamily Hypodermatinae. 4 pp. 

 Ouchi Y., 1939: Diptera Sinica. Tabanidae. I. On some horseflies belonging to the subfamily, Pangoninae from Eastern and Northern China, Manchoukuo and Northern Corea. 16 pp. 

 Ouchi Y., 1940: Contributiones ad cognitionem insectorum Asiae orientalis. X. On a new species beloging to genus Coryzonera (Tabanidae) from Japan. 3 pp. 

 Oudemans J. T., 1899: Infectie door sluipvliegen. 4 pp. 

 Ouellet J., 1941: Additions au catalogue des Diptéres du Ouébec. 21 pp. 

 Ovazza M., 1956: Contribution a l’étude des Dipteres vulnérants de l’Empire d’Éthiopie. III. Tabanidae. 8 pp. 

 Ovazza M., 1962: Une nouvelle espece de Tabanus (Diptera: Tabanidae) trouvée en AFrique occidentale: Tabanus moreli, n. sp. 6 pp. 

 Ovazza M., Hamon J., Rickenbach A., Morel J., 1956: Contribution a l’étude des Tabanidae (Diptera) d’Afrique occidentale francaise. 13 pp. 

 Ovazza M., Rickenbach A., Hamon J., 1956: Essai de séparation des différentes formes de Tabanus secedens Walker (Diptera: Tabanidae) par l’étude des terminalia femelles. 11 pp. 

 Overgaard Nielsen B., 1971: Some observations on biting midges (Diptera: Ceratopogonidae) attacking grazing cattle in Denmark. 5 pp. 

 Ovtshinnikova O. G., 1983: The functional morphology of the male genitalia of Ptecticus tenebrifer Walker (Diptera, Stratiomyidae) and Solva ussuriensis Pleske (Diptera, Solvidae). 4 pp. (in Russian). 

 Ovtshinnikova O. G., 1986: Musculature of male genitalia in flies of the superfam. Stratiomyioidea (Diptera). 14 pp. (in Russian). 

 Ovtshinnikova O. G., 1987: Musculature of the male genitalia in flies of the family Coenomyiidae and systematic position of this family among the lower Brachycera (Diptera). 9 pp. (in Russian). Entomologitsheskoe obozrenie 66(2): 256-264.

 Ovtshinnikova O. G., 1993: Homologization of the male genital sclerites of the Diptera Brachycera based on the study of the musculature. 10 pp. (in Russian). Entomologitsheskoe obozrenie 72(4): 737-746.

 Ovtshinnikova O. G., 1996: Peculiarities of the structure of male genitalia in some species of hover-flies (Diptera, Syrphidae). 11 pp. (in Russian). Entomologitsheskoe obozrenie 75(3): 542-552.

 Oye P., 1936: Observations sur la biologie des larves de Simulium (Melusina) Diptére. 11 pp. 

 Ozerov A. L., 1983: Notes on Sepsidae (Diptera) of the Far East. 3 pp. (in Russian). Entomologitsheskoe obozrenie 62(3): 635-637.

 Ozerov A. L., 1985: A new and little known species of the Sepsidae (Diptera) from the Far East. 6 pp. (in Russian). Entomologitsheskoe obozrenie 64(4): 839-844.

 Ozerov A. L., 1986: K poznaniju muravjevidok (Diptera, Sepsidae) fauny SSSR. 6 pp. 

 Ozerov A. L., 1986: To the knowledge of Sepsidae (Diptera) of the fauna of the USSR. 6 pp. (in Russian). Entomologitsheskoe obozrenie 65(3): 639-644.