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Vladimir Vladimirovich Nabokov (; Russian: Vladimir Vladimirovich Nabokov, pronounced [vla'djimjIr na'bok@f] ( listen), also known by the pen name Vladimir Sirin; 22 April [O.S. 10 April] 1899 - 2 July 1977) was a Russian-American novelist, translator and entomologist.

Nabokov's interest in entomology had been inspired by books of Maria Sibylla Merian he had found in the attic of his family's country home in Vyra. Throughout an extensive career of collecting he never learned to drive a car, and he depended on his wife Vera to take him to collecting sites. During the 1940s, as a research fellow in zoology, he was responsible for organizing the butterfly collection of the Museum of Comparative Zoology at Harvard University. His writings in this area were highly technical. This, combined with his specialty in the relatively unspectacular tribe Polyommatini of the family Lycaenidae, has left this facet of his life little explored by most admirers of his literary works. He described the Karner blue. The genus Nabokovia was named after him in honor of this work, as were a number of butterfly and moth species (e.g. many species in the genera Madeleinea and Pseudolucia bear epithets alluding to Nabokov or names from his novels). In 1967, Nabokov commented: "The pleasures and rewards of literary inspiration are nothing beside the rapture of discovering a new organ under the microscope or an undescribed species on a mountainside in Iran or Peru. It is not improbable that had there been no revolution in Russia, I would have devoted myself entirely to lepidopterology and never written any novels at all."  The palaeontologist and essayist Stephen Jay Gould discussed Nabokov's lepidoptery in his essay, "No Science Without Fancy, No Art Without Facts: The Lepidoptery of Vladimir Nabokov" (reprinted in I Have Landed). Gould notes that Nabokov was occasionally a scientific "stick-in-the-mud". For example, Nabokov never accepted that genetics or the counting of chromosomes could be a valid way to distinguish species of insects, and relied on the traditional (for lepidopterists) microscopic comparison of their genitalia.  The Harvard Museum of Natural History, which now contains the Museum of Comparative Zoology, still possesses Nabokov's "genitalia cabinet", where the author stored his collection of male blue butterfly genitalia. "Nabokov was a serious taxonomist," says museum staff writer Nancy Pick, author of The Rarest of the Rare: Stories Behind the Treasures at the Harvard Museum of Natural History. "He actually did quite a good job at distinguishing species that you would not think were different--by looking at their genitalia under a microscope six hours a day, seven days a week, until his eyesight was permanently impaired." The rest of his collection, about 4,300 specimens, was given to the Lausanne's Museum of Zoology in Switzerland.  Though his work was not taken seriously by professional lepidopterists during his life, new genetic research supports Nabokov's hypothesis that a group of butterfly species, called the Polyommatus blues, came to the New World over the Bering Strait in five waves, eventually reaching Chile.  Many of Nabokov's fans have tried to ascribe literary value to his scientific papers, Gould notes. Conversely, others have claimed that his scientific work enriched his literary output. Gould advocates a third view, holding that the other two positions are examples of the post hoc ergo propter hoc fallacy. Rather than assuming that either side of Nabokov's work caused or stimulated the other, Gould proposes that both stemmed from Nabokov's love of detail, contemplation, and symmetry.
Vladimir Nabokov