AbstractIntroduction: Identification of sex by human skeletal remains is very important in anthropological and medico legal works. Over the years different authors had carried various types of measurements on dry human sacrum. Materials and Methods: The present study carried out on 50 sacra of unknown sex contains 24 male and 26 female sacra identified by physical characteristics. They were collected from Gujarat. Parameters like maximum sacral length and maximum sacral breadth were measured on the sacrum and sacral index calculated by that. Results: In present study the mean of sacral length in male is 102.58 mm and in female 111.74 mm. The mean of sacral breath in male is 103.21 mm and in female 102.34 mm and the sacral index is 99.68 in male and 109.36 in female. This index was compared with similar studies from Gujarat and other parts of India. Conclusion: Sacral index and sacral length both are statistically significant. So from sacrum it is possible to identify sex and also help in medicolegal aspects.