Background:Femoral shaft fracture is an incapacitating paediatric injury.This study was conducted to assess the functional outcome of paediatric femur fractures treated with Ender nailing in the age group of 5 to 16 years. Materials and Methods: We collected the records of the patients by special proforma. Essential investigations of all the patients were done. Patients were followed up at intervals of 6 weeks, 12 weeks and 24 weeks. At follow ups, patients were studied regularly by clinical findings and x-rays. Documentation was made according to the proforma. As soon as the patient was brought to casualty, the patient’s airway, breathing and circulation were assessed. Then a complete survey was carried out to rule out other significant injuries. Plain radiographs of AP and lateral views of the thigh including hip and knee joints to assess the extent of fracture comminution, the geometry and the dimensions of the fracture. Results: Surgery was done in less than 7 days for 92% of cases and more than 7 days for 8% of cases, the mean duration being 3.42 days. The mean duration of time for fracture union was 8.4 weeks. The average hospital stay was 7.56 days. The mean duration for starting full weight bearing was 10.12 weeks. Conclusion: In the present study, there are 25 (50%) Right side fractures and 25 (50%) left side fractures. The right to left ratio is 1: l in our study. Thus, there is an equal distribution of left and right fracture in the study. The most common mechanism of injury in our study was found to be due to RTA. Out of 50 patients, 31 patients had injuries due to RTA whereas 19 patients had injury due to fall. These findings are comparable with other series. In the present study, 12 (24%) patients had proximal l/3rd of shaft femur fracture, 34 (68%) had fracture of middle l/3rd and 4 (8%) patients had fracture of the distal 1/3 d shaft of femur. Hence, the most common level of fracture is the middle 1/3rd of the shaft of femur. This was comparable with the other series. In our study, out of 50 patients 45 (90%) patients had closed fracture of shaft of femur, 2 patients had Open grade 1 fracture of shaft of femur and 3 patients had Open grade 2 fracture of the shaft of femur.