The present study deals with pharmacognostical, phytochemical and anthelmintic evaluation of leaves of Naringi crenulata. This evaluation reveals the presence of many phytochemical constituents. Leaves were extracted with petroleum ether, chloroform and methanol. Crude tannins were isolated from methanol extract and evaluated for anthelmintic activity. Chloroform, methanol extracts and crude tannins showed very good anthelmintic activity. Paralysis and death times of crude tannins were very close to standard drug Albendazole.