Bone defects in revision total hip arthroplasty (rTHA) are most often caused by osteolysis, loss of component fixation, periprosthetic joint infection (PJI), or progressive bone loss after multiple revisions. Acetabular and femoral defects require specific management based on the size and location. Strategies may include metallic augments, bone grafting, or graft substitutes. The specific choice of bone graft or substitute is critical to restoring bone stock, promoting osteogenesis, and ensuring implant stability. This chapter will review the properties of different types of bone grafts and include clinical cases that highlight bone graft techniques used in revision THA.