Retrograde Interlocking Nail Femur was used in 35 cases of complex femoral fractures with follow up of two yr. The cases included with gross comm. femoral frx. with ipsilateral frx. of neck femur and tibia. This technique of fixation is also used in management of pathalogical frx. of upper third of femur and also in very obeese patients with frx. shaft of the femur in which antigrade nailing is a problem because of obesity. This method of fixation is a simple closed technique to manage such complex frx. with good results. Knee movements regained in all cases accept one, malrotation were observed in two early cases of the series. Non union and implant failure was nil. Bone grafting was required in one case of highly comm. segmental frx. with delayed union.