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• Rev. John O’ Rourke, The history of the great Irish famine of 1847, with notices of earlier Irish famines, Dublin, J. Duffy & Co., 1902. archive.org
• Jan Obenberger, Entomologie V, Prague, Nakladatelstvi CSAV, 1964. Institut Nencki, Varsovie
• Ernest Ogan (Edit.), Fresh-water life. The wonderland of knowledge, vol.  V. Londres, Odham Press, 1933. Bouquiniste
• Frère Ogerien, Histoire naturelle du Jura et des départements voisins, Zoologive vivante, tome III, Paris, Victor Masson, 1863. (0) M.H.N. Nîmes
• Lorenz Oken, Okens Lehrbuch der naturgeschichte, vol. 3 Theil Zoologie, Iena, August Schmid und Comp, 1815. B.M.H.N., Paris
• Günter Olberg, Blüte und Insekten, Leipzig, Akademische Verlagsgesellschaft Geest- Portig,1951. (?)
• Harold Oldroyd, Collecting, preserving and studying insects, Londres, Hutchinson, 1958. (0)  Museum Library, Norwich
• Harold Oldroyd, Insects and their world, Londres, Natural History Museum, 1966. B.M.H.N., Paris
• Guillaume-Antoine Olivier, Encyclopédie méthodique ,Histoire Naturelle, Insectes, tome VI, Paris, Panckoucke, 1791. B.M.H.N., Paris
• F. M. Edouard Opel, Lehrbuch der forstilchen Zoologie, Vienne, Braumüller, 1869. (?)
• George Ordish, Garden pests, Londres, Hart-Davis, 1956. G.B.
• Edward Latham Ormerod, British Social Wasps: an introduction to their anatomy and physiology and General Natural History, Londres, Longmans, Green, 1868. G.B.
• Eleanor Ormerod, Methods of insect life and prevention and remedy of insect rampage, Londres, Simpkin, Marshall & Co., 1884. archive.org
• A. U. G.Ortleb, Insekten. Tausenfüssler und Spinnentiere. Der Emsige Naturfokscher und Sammler, Berlin, S. Mode Verlag, circa 1900. (?)
• Herbert Osborn, A brief history of entomology : including time of Demosthenes and Aristotle, Colombus (OH), The Spahr & Glenn Company, 1952. G.B.
• Raymond C. Osburn, The care of home aquarium, New-York, The New York Zoological Society, 1914.  B.M.H.N., Paris
• Johannes Theodorus Oudemans, De nederlandsche insecten, La Haye, Martinus Nijhoff, 1900. B.M.H.N., Paris
• Ouida pseudo de Marie Louise De La Ramée, Puck: his vicissitudes, Adventures, Observations, Conclusions friendships and Philosophies, Londres,  Chatto & Windus, 1899. G.B.
• Frank Overton & Mary E. Hill, Nature Study A pupil’s Text-Book, New York, American Book Company, 1905. (0) archive.org
• Jennifer Owen & Ian Jackson & Alan Harris & John Schackell, Mysteries and Marvels of Insect Life, Tulsa (OK), E.D.C. Publishing 1985. (?)
• Jennifer Owen & Ian Spellerberg & Ian Wallace, More mysteries and marvels of nature, Londres, Ursborne Publishing, 1984. (0) Bouquiniste
• Richard Owen, Palaeontology or Systematic summary of extinct animals and their geological relations, Edimbourg, A. & C. Black 1860. G.B.
• Owen D. Owens, How to save your local Stream, 1993. (?)