Vilém Dušan Lambl (December 5, 1824, Letiny (German: Letina, Lettin) - February 12, 1895) was a Czech physician from Letina, Kreis Pilsen, Bohemia.
Lambl had a keen interest in the field of linguistics, particularly Slavic languages. He earned his degree in medicine from the University of Prague, and from 1848 travelled in Croatia, Serbia, Dalmatia, and Montenegro researching southern Slavic languages and culture. After his return to Prague, he worked at Löschner's children's hospital until 1860, when he accepted a position at Kharkiv University.
He is remembered for his description of an intestinal protozoan parasite that was initially discovered by Anton van Leeuwenhoek (1632-1723), and is a cause of gastroenteritis. Lambl called the protozoan Cercomonas intestinalis. In 1888 the name was changed to Lamblia intestinalis by zoologist Raphael Anatole Émile Blanchard (1819-1900}. In 1915 the species was renamed to Giardia lamblia by zoologist Charles Wardell Stiles (1867-1941} in honor of Lambl and French biologist Alfred Mathieu Giard (1846-1908). Today the illness caused by the parasite is called either lambliasis or giardiasis.
Eponym named after Lambl: