Tropidophorus murphyi, also known commonly as Murphy's water skink, is a species of lizard in the subfamily Sphenomorphinae of the family Scincidae. The species is endemic to Vietnam.
The specific name, murphyi, is in honor of Canadian herpetologist .
Adult males of Tropidophorus murphyi have a snout-to-vent length (SVL) of about . Adult females are larger, about SVL.
Tropidophorus murphyi is found in northern Vietnam, in Cao Bang Province.
The natural habitat of Tropidophorus murphyi is rocky streamsides in forest, at elevations of .
Tropidophorus murphyi bears live young by ovoviviparity. Litter size is three to five neonates.