Laccognathus is an extinct genus of amphibious lobe-finned fish from Europe and North America.

[1] Species of Laccognathus were characterized by the presence of three large pits (fossae) on the external surface of the lower jaw, which may have had sensory functions.

[3] The skeleton of Laccognathus was structured such that large areas of the skin were stretched out over solid plates of bone.

Their closest living relatives are the members of the subclass Dipnoi (lungfish).

A fourth undescribed species recovered from the Middle Devonian of Latvia may exist.