Atopophrynus is a genus of frogs. It is monotypic, being represented by a single species, Atopophrynus syntomopus, also known as the Sonson frog. Its taxonomic placement within the superfamily Brachycephaloidea is uncertain, although many sources place it in the family Craugastoridae. It is endemic to Colombia and only known from its type series from Sonsón, in the Cordillera Central, Antioquia Department.