Hermarchus leytensis is a species of stick insect in the order Phasmatodea. It is endemic to the Philippines.
Hermarchus leytensis exhibit sexual dimorphism. Adult females are bulky and typically have a body length of 130-150mm. They are a bright green in color. Males are thin, winged, and are about 95mm in length.
This species occurs in the Philippines, with known records from Leyte Island.