WGeorge James Allman FRS FRSE was an Irish ecologist, botanist and zoologist who served as Emeritus Professor of Natural History at Edinburgh University in Scotland.
WWilliam Archer was an Irish naturalist and microscopist especially interested in Protozoa and Desmids.
WJohn Ball was an Irish politician, naturalist and Alpine traveller.
WRobert Ball was an Irish naturalist. He served as the Director of the Dublin University Museum, and developed a method of dredging known as "Ball's dredge." He served as a secretary to the Royal Zoological Society of Ireland for two decades and was responsible for popularizing natural history through public educational outreach.
WValentine Ball was an Irish geologist, son of Robert Ball (1802-1857) and a brother of Sir Robert Ball. Ball worked in India for twenty years before returning to take up a position in Ireland.
WJames Bryce LLD FRSE was an Irish mathematician, naturalist and geologist.
WNathaniel Colgan was a self-taught Irish naturalist primarily known for his botanical work.
WCharles Donovan MD was an Irish medical officer in the Indian Medical Service. He is best remembered for his discoveries of Leishmania donovani as the causative agent of visceral leishmaniasis, and Klebsiella granulomatis as that of donovanosis. The son of a judge in India, he was born in Calcutta and completed his primary education in India, and continued secondary school in Cork City, Ireland. He graduated in medicine from Trinity College, Dublin and joined the Indian Medical Service. He participated in British expeditions to Mandalay in Burma, Royapuram and Mangalore in India, Afghanistan, and finally Madras, where he spent the rest of his service. He was professor at Madras Medical College from 1898 until his retirement in 1919.
WWilliam Hincks was an Irish Unitarian minister, theologian and professor of natural history. He was the first professor of natural history at University College, Toronto and president of the Canadian Institute. He was also the first editor of the Unitarian magazine The Inquirer.
WSurgeon-General Thomas Heazle Parke (1857–1893) was an Irish doctor, explorer, soldier and naturalist.
WRobert Templeton was a naturalist, artist, and entomologist, and was born at Cranmore House, Belfast, Ireland.
WWilliam Thompson was an Irish naturalist celebrated for his founding studies of the natural history of Ireland, especially in ornithology and marine biology. Thompson published numerous notes on the distribution, breeding, eggs, habitat, song, plumage, behaviour, nesting and food of birds. These formed the basis of his four-volume The Natural History of Ireland, and were much used by contemporary and later authors such as Francis Orpen Morris.