A control device for a human-powered vehicle includes an electronic controller configured to control a transmission device. The transmission device is configured to shift a transmission ratio that is a ratio of a wheel rotational speed of a drive wheel of the human-powered vehicle to a crank rotational speed of a crank axle of the human-powered vehicle. The electronic controller is configured to control the transmission device so as to restrict a first shifting action that increases the transmission ratio in a case where a pitch change amount is greater than or equal to a first change amount. The pitch change amount is a change amount of a pitch angle of the human-powered vehicle.