A current sensing circuit and a boost converter including the current sensing circuit are disclosed. The current sensing circuit includes a switching device, a sensing transistor, and a current sensing amplifier, and senses the current flowing through the switching device. The current sensing amplifier maintains a potential of an output terminal of the switching transistor substantially equal to a potential of an output terminal of the sensing transistor based on a difference between an output current of the switching device and an output current of the sensing transistor. Accordingly, the current sensing circuit accurately senses the current flowing through the switching device.