William Ogilby (1805 – 1 September 1873) was a zoologist born in Ireland. In the 1830s, he was a leader in classifying and naming animal species. He worked as the Secretary of the Zoological Society of London from 1839 to 1847. During the Great Famine, he moved back to Ireland. Later, he built a large but plain-looking building called Altinaghree Castle near Donemana, County Tyrone. In 1846, a mountain in Queensland was named Mount Ogilby in his honor.