A post-mortem study was conducted to differentiate male and female sternum. A total 100 sternums of adult individuals (56 males & 44 females) were obtained from the cases brought for autopsy to the Department of Forensic Medicine & Toxicology, Lady Hardinge Medical College, New Delhi between the periods August 2005 to March 2007. Our study concluded that the sternal index was not reliable for determining sex.