G
- Galach – Universal language of the Dune universe.
- Ghola – A type of Clone grown in an axlotl tank from genetic material retrieved from the cells of a deceased subject.
- Glowglobe – "Suspensor-buoyed illuminating device, self-powered (usually by organic batteries)."
- Golden Path – Leto II's strategy to prevent humanity's destruction.
- Gom jabbar – "Specific poison needle tipped with meta-cyanide used by Bene Gesserit Proctors in their death-alternative test of human awareness."
- Great Convention – "Universal truce enforced under the power balance maintained by the Guild, the Great Houses, and the Imperium. Its chief rule prohibits the use of atomic weapons against human targets."
- Guild Navigator – Melange-mutated humans able to safely navigate interstellar space (using prescience) in ships called Heighliners.
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