There were many parameters to bring out the sex, ethnicity and race based on morphometry of skull. Cephalic index is one of the important parameter in sex determination and classification of human crania. In the present study, an attempt was made to report the sexual dimorphism in 100 human crania of known sex based on the cranial index. Maximum Cranial Breadth (MCB) and Maximum Cranial Length (MCL) were measured and the cranial index was calculated as per the formula. Descriptive statistics was applied to find the significance of the parameters in determining the sex. The mean maximum cranial breadth in female was 11.8__ampersandsignplusmn;0.81 and in male was 12.2__ampersandsignplusmn;0.68.The mean maximum cranial length in female was 16.4__ampersandsignplusmn;0.69 and in male was 17.5__ampersandsignplusmn;0.74.Considering the above parameters individually both of them were observed to be significant with p__ampersandsignlt;0.05 based on student__ampersandsignlsquo;t-test__ampersandsignrsquo;. Mean Cephalic Index (MCI) in female was 71.48__ampersandsignplusmn;5.81 and male was 69.75__ampersandsignplusmn;4.02 are statistically significant.These three variables were observed to discriminate both sexes by 85%. This indicates the importance of cephalic index as a suitable predictor of sexual dimorphism.