This paper treats Chinese species of genus Diglyphus Walker, 1844. Fourteen species are treated, including D. isaea (Walker). Six species are described as new: D.albineruis, D. albitibiae, D. bimaculatus, D. gibbus, D. inflatus, D. metallicus; seven species are newly recorded in China: D. albiscapus Erdös, D. begini (Ashmead), D. crassinervis Erdös, D. minoeus (Walker); D. pachyneurus Graham, D. pulchripes (Crawford), D. pustenzis Erdös & Novicky. Species are mainly parasitoids of leafmining Agromyzidae, including the economically important genus Liriomyza.