This is the third part of study on Chinese Serpulidae and Spirorbidae. A total of 24 species, belonging to Apomatus, Circiger, Ditrupa, Salmacina, Metavermilia, Pomatoleios, Pomatostegus and Protula of Serpulidae, and Circeis, Dexiospira, Duplicaria, Eulaeospira, Janua, Pileolaria and Simplicaria of Spirorbidae are identified. Among them 10 species are recorded for the first time from the Chinese Waters and 1 complex group Filograna/Salmacina dyster Huxley. A list of the species is given in which those marked with an asterisk are recorded for the first time from China.