Mastotermes electromexicus is an extinct species of termite in the family Mastotermitidae known from a group of Late Oligocene to Early Miocene[1] fossils found in Mexico.

[2] Mastotermes electromexicus is known from a series of fourteen fossil insects which are inclusions in transparent chunks of Mexican amber.

[1] The holotype was first studied by entomologists Kumar Krishna of the American Museum of Natural History and Alfred Emerson of the University of Chicago.

Krishna and Emerson's 1983 type description of the species was published in the natural sciences journal American Museum Novitates.

The specific epithet electromexicus was coined from the Greek word "ēlektron" meaning amber combined with Mexico as a reference to the nature of the preservation and the country of the type locality.