Background: Estimation of sex represents one of the most important aspects of analysis in forensic anthropology. Selection of appropriate methods depends on what skeletal elements are present and what general age is represented. The pelvis is possibly the most accurate bone in the human body for age and sex determination, with the accuracy being 95% when completed. Aim: This study aimed to test the accuracy of sex identification using digital pelvic radiography in a sample of Libyan Population in Tripoli. Subjects and methods: This cross- section study was carried out at the Orthopedic Traumatic Center of Tripoli Hospital, Libya during the period study from January to March 2020. It included 156 persons (15-25 years) in two groups; Group I which include 78 Males. Group II which included 78 females). All subjects will be subjected to antero-posterior pelvis X-rays to determine sex estimation by the height of ilium, interacetabular distance, acetabular diameter, pelvic breadth and pelvic inlet breadth. Results: In comparison between male and female in different measured parameters, there was a statistical significance increase in the height of ilium and acetabular diameter in males and in inter-acetabular distance and breadth of pelvic inlet among females; but no statistical significance difference found between males and females in greatest breadth of pelvis. Conclusion: The pelvis bone could be used for sex determinations with the maximum percentage of 68% sex estimation accuracy. It may be a reliable tool in estimation of forensic sex estimation. Keywords: Forensic, Age assessment, Pelvic bone, X-ray