Johannes Govertus de Man (1850–1930) was a Dutch biologist and a pioneer in Nematology. He was (assistant) curator at the “Rijksmuseum van Natuurlijke Historie” in Leiden (1872-1883), where he specialised in free-living nematodes and decapod crustaceans.
After leaving the museum he continued this work as an independent researcher, mainly working from his house in Yerseke (Zeeland). Although he described nematodes from all continents, he paid ample attention to the nematodes from his near surroundings.
In the course of time the Laboratory of Nematology has collected a number of drawings of De Man. A considerable number was made available on the website of the Laboratory of Nematology and now also in Wageningen UR Image Collections. The original drawings are kept at the Plant Protection Service in Wageningen and are on request available for further research.