Henryk Ferdynand Hoyer (13 July 1864 – 17 October 1947) was a Polish zoologist and professor of comparative anatomy at the Jagiellonian University from 1894 to 1934 serving also as its rector. He is sometimes referred to as Henryk Hoyer junior to differentiate him from his father, Henryk Frederyk Hoyer (1834-1907), who is considered the founder of histology in Poland.