Jan Feliks Tur (25 August 1875 – 8 May 1942) was a Polish zoologist who specialized in embryology, mutagenesis, and teratology at the University of Warsaw. His family belonged to the Korczak clan of nobles. Tur was born at Radziwiliszki near Grażun to landowner Jarosław Daniel and Maria née Rymkiewicz. After schooling in Vilnius and Częstochowa, he studied zoology at the Warsaw Imperial University under Pavel Mitrofanov and became his assistant in 1899. After receiving a doctorate from the Jagiellonian University on avian teratology under Józef Nusbaum-Hilarowicz he went on internships to Vill