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Gabriel Bonsdorff was a Finnish entomologist. who specialised in Coleoptera notably Curculionidae.

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Pekka T. Lehtinen is a Finnish arachnologist and taxonomist. He is known for his works in systematics and for the many expeditions in which he has participated.

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Count Carl Gustaf Mannerheim was a Finnish entomologist and governor of the Viipuri province in the Grand Duchy of Finland.

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William (Wilhem) Nylander was a Finnish botanist and entomologist. Nylander was born in Oulu, and taught at the University of Helsinki before moving to Paris, where he lived until his death in 1899.

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Enzio Rafael Reuter was a Finnish entomologist who specialised in Lepidoptera.

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Odo Morannal Reuter (1850–1913) was a Swedo-Finnish zoologist and poet.

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Carl Reinhold Sahlberg was a Finnish naturalist, primarily an entomologist specializing in beetles.

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Johan Reinhold Sahlberg was a Finnish entomologist.