Name
- Adams, Andrew Leith, FRS1
- Adams, William Grylls, Professor of Natural Philosophy King's College London1
- Agardh, Jacob Georg, Swedish naturalist1
- Aguilar, Rafael, Secretary of the Sociedad Mexicana de Historia Natural1
- Alcock, John Rutherford, Knight, diplomatist, 1809-18971
- Alherstone, William Guybon, of Grahamstown, S Africa1
- Andrewes, Frederick William, Knight, pathologist and bacteriologist, 1859-19321
- Andrews, Charles William, FRS1
- Andrews, William Ryton, Reverend; of Teffont Ewyas1
- Ansperg, Robert, of Königsberg1
- Arnott, James Moncrieff, Fellow of the Royal College of Surgeons1
- Audouin, Jean Victor, French entomologist1
- Austen, Nathaniel Laurence, naturalist1
- Austen, Robert Alfred Cloyne, geologist, 1808-18841
- Aymard, Auguste, Secretary of the Soc. Académique du Puy1
- Babington, Charles Cardale, Professor of Botany, Cambridge University, 1808-18951
- Bagg, Rufus Mather, of Johns Hopkins University, 1869-19461
- Baillon, Henri Ernest, botanist, physician, 1827-18951
- Baily, William Hellier, palaeontologist; of the British Geological Survey, 1819-18881
- Baker, Benjamin, Knight, civil engineer, 1840-19071