The grey-crowned crocias (Crocias langbianis) is a species of bird in the family Leiothrichidae. It is endemic to Vietnam, where it has a highly restricted distribution in the Da Lat Plateau.

Its natural habitat is intact broadleaf evergreen forest and secondary forest, generally near watercourses, between 910–1450 m above sea-level. It is threatened by habitat loss, although the species is elusive and easily overlooked, so much so that it was previously considered critically endangered.