Hans Fruhstorfer (1866 – 1922) was a German explorer, insect and shell trader and entomologist who specialised in Lepidoptera.

After his successful endeavor, he spent some time in Sri Lanka (then Ceylon), then in 1890 he went to Java for three years, visiting Sumatra.

In 1899, he went on a three-year journey to the United States, Oceania, Japan, China, Tonkin, Annam and Siam, returning via India.

Following his travels, he settled in Geneva where he wrote monographs based on the specimens in his extensive private collection.

No longer travelling himself, Fruhstorfer employed the collectors Hans Sauter in Taiwan (then Formosa) and Franz Werner in New Guinea.