In cases of non-union of the humerus with segmental bone defect, if a conventional treatment has failed, free fibular transfer should be considered as a reliable option to allow satisfactory bone union. We reported five cases of aseptic and multi-operated non-union of the humerus from trauma. In each case, a free fibular flap was performed after failure of a conventional treatment and bony union was demonstrable radiologically within six months. Some technical points such as harvesting of the fibula, humerus approach, fibula placement and fixation are highlighted in order to simplify the transfer and to standardise the technique.