BACKGROUND Spondylolysis is defined as a defect in the pars interarticularis of the vertebral arch, which is a bony bridge connecting the superior and the inferior articular facet joints. Aims and Objectives: To determine the incidental occurrence of lumbar spondylolysis, the common site and type of involvement and the associated degenerative disorders in the patients in an unselected population. MATERIALS AND METHODS This is a cross-sectional study in which incidental spondylolysis was evaluated for 852 patients (462 females and 380 males) who underwent multidetector (16 slice) CT abdomen/ (Kidney Ureter Bladder) using bone and soft tissue algorithm. Overview of Literature-There are very less number of studies regarding the prevalence of incidental spondylolysis, the common site and the type of involvement in a developing country. RESULTS CT Abdomen/ KUB imaging showed higher prevalence of incidental lumbar spondylolysis. Most common level involved was L5 vertebra, the common type was isthmic. Age wise distribution of type of spondylolysis and grading of listhesis was significant. CONCLUSION CT Abdomen/ KUB imaging of an unselected Indian population showed higher prevalence of incidental lumbar spondylolysis. The prevalence of isthmic type is higher and its progression to spondylolisthesis increases with advancing age.