Mecistocephalus modestus is a species of centipede in the Mecistocephalidae family.

It was described in 1919 by the Italian myriapodologist Filippo Silvestri.

[1][2] This species has 49 pairs of legs and can reach 35 mm in length.

[3] The species occurs in New Guinea and Southeast Asia.

The type locality is Sattelberg, Morobe Province, Papua New Guinea.