Centuria Insectorum (Latin, "one hundred insects") is a 1763 taxonomic work by Carl Linnaeus, and defended as a thesis by Boas Johansson; which of the two men should for taxonomic purposes be credited with its authorship has been the subject of some controversy. It includes descriptions of 102 new insect and crustacean species that had been sent to Linnaeus from British America, Suriname, Java and other locations. Most of the new names included in Centuria Insectorum are still in use, although a few have been sunk into synonymy, and one was the result of a hoax: a common brimstone butterfly with spots painted on was described as the new "species" Papilio ecclipsis.

The contents of the work were published twice, under two slightly different titles. Centuria Insectorum Rariorum ("one hundred rare insects") was published as a standalone thesis, while Centuria Insectorum was published as part of Linnaeus' series of Amoenitates Academicæ ("academic delights"). Both bear the date June 23, 1763, although the latter was printed later, in September 1763.^[1]

Since Centuria Insectorum Rariorum was a thesis presented and defended by one of Linnaeus' students, Boas Johansson (1742–1809) from Kalmar, it has been argued that authorship of the taxa named in it should be assigned to Johansson. The authorship, however, has been the subject of some controversy.^[1]

Several lines of argument have been used to suggest that Linnaeus should be considered the author. The role of the person defending the thesis at Swedish universities at the time was to prove his command of Latin, and responsibility for the text of the thesis rested mainly, if not entirely, with the professor.^[1] Linnaeus appeared to consider himself the author, referring in his later works to Amoenitates Academicæ without including an abbreviation for the author, as he did for works written by other people.^[1] Works presented by students of other taxonomists of the era (such as Carl Peter Thunberg, Adam Afzelius and Elias Magnus Fries) are generally credited to their supervisors, and not the students themselves.^[1] Finally, most zoologists, and "Scandinavian authorities on Linnaeana" consider Linnaeus the author;^[1] in the interests of nomenclatural stability, it is preferable to continue doing so. The issue was raised in a petition to the International Commission on Zoological Nomenclature and, although a large majority voted in favour of recognising Linnaeus as the author, the one dissenting vote caused the commission to defer its decision.^[2]

The specimens used by Linnaeus or Johansson in writing Centuria Insectorum include some provided by Dr Alexander Garden, a horticulturist from Charles Town in the Province of South Carolina,^[3] by Carl Gustav Dahlberg in Suriname,^[4] by Hans Johan Nordgren in Java,^[5] and from the collection of Baron Charles De Geer from the Province of Pennsylvania.

The dissertation begins by discussing improvements that the Linnaean system of taxonomy has brought to the study of insects, before describing the new species.^[6]