Trimeresurus rubeus, commonly known as the ruby-eyed green pitviper, is a venomous pit viper species endemic to Southeast Asia.

It occurs in southern Vietnam and eastern Cambodia.

[3] Trimeresurus rubeus inhabits seasonal tropical forests, including lightly disturbed ones.

All specimens have been recorded at night in dense vegetation, often near fast-flowing streams.

Although most known populations occur in national parks, it can be threatened by habitat loss and harvesting for food and snake wine.