William Ogilby FRAS FLS FZS FGS MRIA (1805–1873) was an Irish-born zoologist who was at the forefront of classification and naming of animal species in the 1830s and served as Secretary of the Zoological Society of London from 1839 to 1847. He removed to Ireland during the Great Famine and later built the grand but architecturally dismal Altinaghree Castle near Donemana, County Tyrone. Mount Ogilby in Queensland was named for him in 1846.