Erythrolamprus mertensi, also known commonly as Mertens's tropical forest snake, is a species of snake in the subfamily Dipsadinae of the family Colubridae. The species is endemic to Venezuela.
The specific name, mertensi, is in honor of German herpetologist Robert Mertens.
Erythrolamprus mertensi is found in the Venezuelan state of Aragua.
The preferred natural habitat of Erythrolamprus mertensi is forest, at elevations of .
Erythrolamprus mertensi is terrestrial and diurnal.
Erythrolamprus mertensi is oviparous.