An injection molding system, to produce fiber-reinforced plastics material parts, has an injection molding device with a housing and a housing bore formed therein. A screw shaft, which is rotatably drivable about a rotational axis and can be displaced along the rotational axis, is arranged in the housing bore to melt and introduce plastics material into a mold. For feeding fibers, the injection molding system furthermore has a feed device, which is configured in such a way that cut fibers can be fed through a feed opening directly into the housing bore. The injection molding system according to the invention allows simple and flexible production of fiber-reinforced plastics material parts.