An experiment conducted to assess the effect of Nelumbo nucifera leaf extract on nutritional indices of Spodoptera litura at various concentrations, showed that 10 & 15% leaf extracts of N. nucifera had influence on growth rate, consumption index, approximate digestibility and efficiency of conversion of digested and ingested food. N.nucifera leaf extract @ 5% concentration showed very low influence on nutritional indices and it was more or less similar to untreated castor discs. 5% concentration had no antifeedant effect and 10 &15% of the extract had high influence on nutritional indices and confirmed as strong antifeedant.