Feeding deterrent effect of acetone and chloroform extract of Cleistanthus collinus (Roxb.) Benth. ex. Hook. f. leaf was studied against third instar Spodoptera litura Fab. at various concentrations (1, 5, 10, 30, 50, 70, 90, and 100 %). Maximum feeding deterrence of 88.20 and 84.59 percent were noticed in chloroform and acetone extract at cent percent concentration respectively. The minimum feeding deterrent effect of 48.20 and 61.31 percent leaf area protection over absolute control was recorded at one percent concentration of acetone and chloroform extract respectively. The feeding deterrence activity was found to increase with increasing concentration of the plant extracts.