Background: Placenta Previa is a potentially serious obstetric complication where the placenta tissue abnormally lies within the lower uterine segment. It affects approximately 0.5% of all labours. Previous caesarean section, advancing age, multi parity, uterine curettage, myomectomy have all attributed as risk factors for placenta previa, Placenta previa is a major cause of third trimester bleeding. Among all these, the most common factor is previous caesarean section which predisposes abnormal placentation to develop placenta previa. So there is relation between previous caesarean section and placenta previa. This study was done to assess the association between previous caesarean section and subsequent development of placenta previa. Methodology: Total 300 respondents were selected, among them 150respondents had the history of previous caesarean Section as case group and another150 respondents had the history of previous normal vaginal delivery as control group. Clinical examination and USG was done at term and subjects were followed till delivery. The Study was conducted in Sir Salimullah Medical College and Mitford Hospital from January, 2017 - December 2017. Results: 06 cases of placenta previa were found in the study group and incidence is 4%compared to 03 cases of placenta previa were found in the control group and incidence is 2% only.