A hip orthosis having:an elastic rotary actuator positioned at the rear part of orthosis；an extensible transmission system, positioned along the side of the user and suitable for transmitting the action of the actuator to the joint of the hip；a link which transmits the mechanical action to user's thigh； anda chain of degrees of freedom through which the threes elements are connected to a frame which interfaces the entire orthosis with the user's body is disclosed. The degrees of freedom can be passive, actuated or connected to elastic elements.
