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ABSTRACT  Species diversity and distribution of freshwater molluscs after waterway dredging in Nongchok Area, Bangkok was conducted. Specimens were collected from 10 stations; Klong Sip Ad, Klong Sip Song, Klong Sip Sam, Klong Sip See, Klong Sip, Klong Song, Klong Kratum lom, Klong Lam Kag, Klong Lam Pla Tiw and Klong Saen Saep. There were 8 families 10 genera and 13 species of gastropods, and 4 families 9 genera and 15 species of bivalves. The most common species found all stations belong to Filopaludina martensi martensi and Pomacea canaliculata, while and Nassarius cf. vinctus, Corbicula lydigiana, C. lydigiana, C. noetlingi, Hyriopsis (Limnoscapha) desowitzi and Physunio superbus were found in only one station in this survey. Furthermore, after waterway dredging, findings indicate 4 species of gastropods and 3 species of bivalves as new records in the central basin for this survey. Alternatively, species that were not found after dredging include 5 species of gastropods and 5 species of bivalves.  Keywords: diversity, freshwater, molluscs, Nongchok, Bangkok