Russell Train's marble gecko (Gekko russelltraini) is a species of lizard in the family Gekkonidae. The species is endemic to southeastern Vietnam.
The specific name, russelltraini, is in honor of American lawyer Russell Errol Train, who was Chairman and Chairman Emeritus of the World Wildlife Fund in the USA.
The preferred natural habitats of G. russelltraini are forest and dry caves, at altitudes of .
G. russelltraini is moderate-sized for its genus. Adults have a snout-to-vent length (SVL) of .