Cajetan von Felder

Baron Cajetan von Felder (; 19 September 1814 – 30 November 1894) was an Austrian lawyer, entomologist and liberal politician. He served as mayor of Vienna from 1868 to 1878.

Life and career Felder was born in Wieden, today the fourth district of Vienna. An orphan from 1826, he attended the Gymnasium of Seitenstetten Abbey, as well as schools in Brno and Vienna, and began to study law at the University of Vienna in 1834. He completed his legal internship in Brno and articled clerk in Vienna, obtaining his doctorate in 1841.

Since 1835 he had made intensive travels throughout Western and Southern Europe, mostly on foot, and studied foreign languages. amassed a huge entomological collection that is deposited in the Naturhistorisches Museum in Vienna and the Natural History Museum in London. A collection of approximately 1,000 letters and postcards sent to Felder between c. 1856 and 1891 is also held by the Natural History Museum. They were sent to Felder, from all over the world, by leading 19th-century entomologists, and deal mainly with the exchange and purchase of specimens, Lepidoptera in particular.