Lebachacanthus is a genus of extinct xenacanth cartilaginous fish known from the late Carboniferous-Early Permian of Europe.

[2] During the late Paleozoic, xenacanths were the apex predators of freshwater ecosystems, preying on small amphibians.

[6] The teeth of this fish were multi-cusped, with the central cusp flanked by two sharp accessory "tines" on which its prey would be impaled and trapped, in preparation for being swallowed whole.

Lebachacanthus patrolled both fresh and marine waters, possibly preying on larvae of the temnospondyli and acanthodians.

Histological and biometric analyses of the spines of specimens provides information on the development and age at death of the fish and the environmental conditions in which they lived.