Mondegodon is an extinct genus of basal "mesonychian" which existed in Portugal, during the earliest Eocene (Neustrian age). It is known from the holotype – UNLSNC-19, and other parts of dentary, recovered from the locality of Silveirinha, Portugal. It was first named by Rodolphe Tabuce, Julien Clavel and Miguel Telles Antunes in 2011 and the type species is Mondegodon eutrigonus. The generic name is derived from "Baixo Mondego", the region where Silveirinha is located; and odon (Greek), for "tooth" by analogy with triisodontid generic names. The specific name is derived from the prefix eu (Greek), "well", and trigonus (Latin), "three-cornered" in reference to the remarkable tricuspidate pattern of the upper molars.