Abstract: The role of physio-morphological characters in determining resistance-susceptibility of soybean (Glycine max L. Merril) genotypes was studied. Ten soybean varieties Psc-62, NARC-VII, Ajmeri, V-I, Soy 95-1, Davis, NARC-VI, S-69-94, Psc-56 and S-72-60 were studied for relative resistance against whitefly (Bemisia tabaci), jassid (Amrasca bigutella Ishida) and soybean looper (Pseudoplusia includens Walker). Significant differences were found to exist among all cultivars for physical parameters, leaf area and leaf hair density and non-significant differences for moisture contents. Leaf area and moisture contents showed positive correlation with whitefly (0.508,0.88), jassid (0.405, 0.913) and soybean looper infestation (0.426, 0.821, respectively) and leaf hair density on abaxial surface of leaf has significantly negative correlation (-0.75, -0,74, -0.926, respectively) with these insect pests. The variety V-1 and Ajmeri are comparatively more resistant having population of whitefly 1.29, jassid 0.62 per leaf respectively. Psc-56 suffered minimum infestation percentage of soybean looper (10). Davis was most susceptible to all three insect pests having infestation of whitefly, jassid and soybean looper (6.39, 2.09, 33.33%, respectively).