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Polychaetes in the family Capitellidae are a group of organisms that are poorly studied in Chinese waters. Among the known capitellid genera in China, Leiochrides Augener, 1914 is an unusual genus in marine surveys.In this study, Leiochrides specimen was obtained during a survey conducted in the Beibu Gulf, northern South China Sea, and described herein as a new species Leiochrides guangxiensis sp. nov. The new species differs from its congeners by having uniramous chaetiger 1, chaetigers 11–12 with notopodial capillaries and neuropodial hooks, abdominal hooks with seven teeth above main fang in three rows, pygidium with 4 anal cirri, and branchial fascicles with up to 17 filaments. The taxonomic status of the monospecific genus Pseudoleiocapitella Harmelin, 1964 and Leiochrides norvegicus Fauchald, 1972 is discussed.