Synthlibonotus is a genus of broad-nosed weevils in the family Curculionidae distributed in northern South America.

[2] The genus Synthlibonotus was characterized by Schönherr as follows: Antennae longiusculae, minus tenues; scapus oculos superans, sensim incrassatus, articulis duobus basalibus funiculi longiusculis, reliquis gradatim paullo brevioribus, omnibus obconicis; clava elongata, subovali.

Rostrum breviusculum, crassiusculum, subteres, apice paullo crassius.

Elytia ovalia, basi truncata, dorso antice deplanata.Synthlibonotus resembles some members of the genus Exophthalmus but can be distinguished by their long antennal scapes that reach beyond the anterior margin of the pronotum.

Members of the genus Synthlibonotus can be found in Mexico, Guatemala, Colombia, and Venezuela.