Provided are a system and method for positioning a mobile device by using a Bluetooth signal, and more particularly, to a system and method for positioning a mobile device by using a Bluetooth signal, in which a location of a user carrying a mobile device is effectively determined by using the mobile device receiving a Bluetooth signal, and a method of positioning the mobile device.Provided are a system and method for positioning a mobile device by using a Bluetooth signal, in which a location of the mobile device may be more accurately determined by considering a Bluetooth signal receiving environment of the mobile device when providing a service and method of determining a location of the mobile device by using a Bluetooth signal.