Lambertus Johannes Toxopeus (1894 - April 21, 1951)[1][2] was a Java-born, Dutch university teacher, entomologist, lepidopterist and botanical collector.[3] In 1921-1922 he participated in the Royal Dutch Geographical and Treub Society expedition to the western Maluku Islands.[3] He gained his doctoral degree in 1930 at the University of Amsterdam and then returned to the island of Java.[3] He mainly worked in Indonesia, then known as the Dutch East Indies, and specialised in the families Lycaenidae and Hesperiidae.[4] In 1934 he collected in Sumatra. In 1938-1939 he participated in the Third Archbold Expedition to Dutch New Guinea.[3] He died in Bandung, Java in 1951.[3]