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- Andrew Garrett (explorer)
- David Geyer
- Theodore Gill
- Gustave Gilson (1859-1944), from Belgium, portrait
- Johann Freidrich Gmelin
- Henry Haversham Godwin-Austen
- Joaquín González Hidalgo y Rodríguez (1839–1923), from Spain, known as Hidalgo
- Augustus Addison Gould
- Stephen Jay Gould, Paleontologist who also studied land snails.
- Arthur Fairfield Gray (1855–1944), USA
- Edward Whitaker Gray (1748–1806), Great Britain
- Elizabeth Gray (biologist) (1831–1924), Great Britain
- Francis Calley Gray (1790–1856), USA
- John Edward Gray (1800–1875), Great Britain
- Maria Emma Gray (1787–1876), Great Britain, wife of John Edward Gray
- Oliver Peter Gray (18??–19??), Great Britain
- Russell Gray (18??–1948), USA
- Sally J. Gray (1952), USA
- Samuel Frederick Gray (1766–1828), Great Britain
- Thomas Gray (biologist) (1820–1910), Great Britain
- Karl Grobben
- Alexandru Vasile Grossu (1910–2004), Romanian malacologist
- Niccolò Gualtieri
- Gerard Pierre Laurent Kalshoven Gude (1858–1924) from Great Britain
- J. T. Gulick (1832–1923), from Hawaii, developed evolution theories with Charles Darwin
Read more about this topic: Malacologist