This chapter presents a discussion on fractures of acetabulum. The acetabulum is the weight-bearing part of the innominate bone. Acetabulum is actually formed at the junction of the ilium, ischium, and pubis after fusion of the triradiate cartilage. Usually, acetabulum fractures are as a result of high-velocity trauma sustained during road traffic accident and is less frequently seen following fall from height or in elderly due to trivial trauma. A thorough initial examination is essential to identify life-threatening conditions and another associated injury. The anteroposterior (AP) view of the pelvis with both the hip joint provide a clear picture about both sides acetabulum, associated pelvic ring fracture and joint disruptions or dislocations. Roof-arc angles are used to assess the size of the intact portion of acetabulum dome. A detailed description on classifications, management, postoperative care, complications, outcome and prognosis following acetabular fracture have been provided in this chapter.