A developing unit and an image forming apparatus having the same are provided. The image forming apparatus includes: an image forming apparatus body, a developing unit which is removably mounted in the image forming apparatus body to develop an image formed on a printing medium, and which includes a handle, and a toner supply unit which is removably mounted in the image forming apparatus body to supply toner to the developing unit. The handle is movable between a first position in which the handle is pressed by the toner supply unit when the toner supply unit is mounted in the image forming apparatus body, thereby yielding part of a occupying space to the toner supply unit, and a second position in which the occupying space yielded to the toner supply unit is restored when the handle is free from a pressure of the toner supply unit.