Eucratonyx is a genus of centipedes in the family Gonibregmatidae.

This genus was described in 1898 by British zoologist Reginald Innes Pocock.

[1][2] Centipedes in this genus are found from the Andaman Islands to New Britain.

[3] Centipedes in this genus feature a concave labral margin fringed by denticles, sternal pores in two anterior paired groups and a posterior band, enlarged claws on some anterior legs with a very elongate basal branch, and coalescent female gonopods.

[3] The smallest species in this genus, Eucratonyx hamatus, can reach 85 mm in length and range from 103 pairs of legs (in males) to 125 pairs (in females); the largest species, E. meinerti, can reach 130 mm in length and range from 103 leg pairs to 129 pairs, the maximum number recorded in this genus.