Name
- Gregory, John Walter, geologist and explorer, 1864-19321
- Griesbach, Carl Ludolph, geologist, 1847-19071
- Griffith, John William, scientist, fl 18801
- Groom, Ann, née Napier, alias de Bourbon d'Este Paleologues Gonzaga, mother of Charles Ottley Groom Napier, 1815-18951
- Groom, Charles Ottley, alias Groom Napier or de Bourbon d'Este Paleologues Gonzaga, imposter, collector, naturalist and self-styled Prince of Mantua and Montferrat, 1839-18941
- Groves, Henry, botanist, 1855-19121
- Grunow, Albert, chemist, naturalist and phycologist, 1826-19141
- Gull, William Withey, 1st Baronet, physician, 1816-18901
- Gunn, John, of Norwich, correspondent of Charles Davies Sherborn, fl 18891
- Guppy, Robert John Lechmere, naturalist and geologist, 1836-19161
- Gurney, Hudson, antiquary, poet and politician, 1775-18641
- Gümbel, Carl Wilhelm, geologist, 1823-18981
- Günther, Albert Karl Ludwig Gotthilf, zoologist, ichthyologist and herpetologist, 1830-19141
- Haast, Johann Franz Julius, Knight, geologist and explorer, 1822-18871
- Haddon, Alfred Cort, anthropologist, 1855-19401
- Haeckel, Ernst, German zoologist, 1834-19191
- Hagenbeck, Carl, German animal trainer and dealer, 1844-19131
- Hale, Edward, clergyman, 1828-18941
- Hall, Francis de Havilland, physician1
- Hall, James, American palaeontologist1