Lamontichthys is a genus of armored catfishes native to South America.

It has been considered to be sister to Harttia, whereas Lamontichthys shows much more similarities with Pterosturisoma microps of the monotypic genus Pterosturisoma, which only differs from Lamontichthys by the number of pectoral fin rays.

[1] There are currently six recognized species in this genus:[2] Lamontichthys is distributed in the northwestern part of South America in the upper Amazon and Orinoco River drainages, and in the Lake Maracaibo region.

[1] Sexual dimorphism in Lamontichthys includes hypertrophied odontodes on the pectoral spines in mature males.

Females lay a few large-sized (1.4–1.8 millimetres or .056–.071 in in diameter) yellowish eggs during each spawning event.