Isodontia mexicana, the Mexican grass-carrying wasp, is a species of insect belonging to the family Sphecidae.

It is mainly found throughout North America, but has become established in Europe, primarily France, Switzerland, Hungary, Italy, Serbia, and Spain.

The adults grow up to 18–20 millimetres (0.71–0.79 in) long, the body is completely black, the thorax is quite hairy and the wings have a smoky-brown color.

Isodontia mexicana is a typical case of a species arrived accidentally from North America and slowly encroaching on the European continent, probably for the lack of predators or parasites.

I. mexicana mainly preys on grasshoppers (usually katydids, Tettigoniidae species) or Tree crickets (Gryllidae species), choosing the small ones and carrying them to its nest to feed the emerging larvae with the living, but paralyzed Orthoptera.