Paedogobius kimurai is a species of fish in the goby family, Gobiidae, and the only member of the monotypic genus Paedogobius. It is native to marine and brackish waters of inner bays in Japan, Thailand and Australia. Its English language common names include wide-gape paedomorphic goby and babyface goby. Its Japanese language common name is shirasukiba-haze. The species is also paedomorphic, with mature adults retaining some characteristics of larvae. The genus name Paedogobius is inspired by this trait. The adult female lacks a pelvic fin.