Non-union in the intertrochanteric region is a rare problem among proximal femoral fractures. Complications such as failure of fixation and implant cut-out are frequent for intertrochanteric fractures. Besides, patient related factors, fracture reduction quality, the implant choice, and the position of the implant are important factors and alter the results. Unlike intertrochanteric region; subtrochanteric part has poor vascularity, and subject to high cortical stress. Therefore, non-union is more frequent and treatment is difficult in this region. In this review, diagnostic and therapeutic approaches to proximal femoral non-union will be discussed.