A hip abduction orthosis for stabilizing the hip joints of a user, provided with a trunk engaging part, first and second thigh engaging parts and first and second coupling parts, wherein the first coupling part connects the first thigh engaging part with the trunk engaging part and the second coupling part connects the second thigh engaging part with the trunk engaging part. A distance between the first and/or the second thigh engaging part and the trunk engaging part is settable. An abduction angle of that thigh engaging part is settable. The distance and the abduction angle are coupled such that a first set distance between that thigh engaging part and the trunk engaging part is coupled with a first set abduction angle and a second set distance different from the first set distance is coupled with a second set abduction angle different from the first set abduction angle.