Aqueous, ethanolic, Benzene extracts from different developmental growth stages of pod and stem bark of C. fistula were investigated for their anthelmintic activity against the earthworm Pheretima posthuma. Different concentrations of extracts were used to determine the anthelmintic activity, which involves time of paralysis and time of death of the worm. Ethanolic young bark and aqueous old bark extracts showed very good anthelmintic activity with respect to paralysis and death time, as compared to control and standard Albendazole (2mg ml -1 ) and Piperazine Citrate (1.5 mg ml -1 ). Hence, extracts of bark and pod might be applied against the chronic infection caused by parasitic worms.