Dutch zoologist (1797-1823).
Johan Conrad van Hasselt (occasionally Johan Coenraad van Hasselt; 24 June 1797 in Doesburg – 8 September 1823), was a Dutch medical doctor, zoologist, botanist and mycologist. Conrad van Hasselt studied medicine at the University of Groningen. In 1820 he went on an expedition to the island of Java, then part of the colonial Dutch East Indies, with his friend Heinrich Kuhl, to study the fauna and flora of the island. They sailed from Texel on 11 July, stopping at Madeira, the Cape of Good Hope and Cocos Island and arriving in Batavia in December 1820. Kuhl died after eight months, van Hasselt