Actuating handle for a window or a door, - with a rotatably mounted handle and an adjoining handle neck, which has a recess on the front side, in which a polygon for actuating a closing mechanism formed in the window or in the door is fixed, and - with a stop body which can be fixed on or in the window or the door, wherein the handle neck of the handle is mounted in an axially-fixed rotatable manner in or on the stop body, - wherein the stop body comprises a lower part and an upper part, - wherein the lower part and the upper part can be connected to one another in a force-fitting, form-fitting and/or frictional manner, - wherein a fitting safety is arranged between the lower part and the upper part, and - wherein the fitting safety has at least one locking element which fixes the handle in at least one distinguished rotational position, and which can be released from its locking against a restoring force via at least one actuating element, wherein each locking element is formed on a slider which can be moved parallel to the stop surface of the window or the door and engages with a latching disc which is connected to the handle neck of the handle in an axially fixed and rotationally fixed manner, characterized in that a locking disc is arranged between the lower part and the upper part, which has a central recess of the same shape as the polygon, and that the slider is slidably stored in a bracket and can be actuated against a restoring force via the actuating element, wherein the locking disc of the actuating handle and the detent disc of the fitting safety being arranged concentrically to the axis of rotation of the handle neck. - with a rotatably mounted handle and an adjoining handle neck, which has a recess on the front side, in which a polygon for actuating a closing mechanism formed in the window or in the door is fixed, and - with a stop body which can be fixed on or in the window or the door, wherein the handle neck of the handle is mounted in an axially-fixed rotatable manner in or on the stop body, - wherein the stop body comprises a lower part and an upper part, - wherein the lower part and the upper part can be connected to one another in a force-fitting, form-fitting and/or frictional manner, - wherein a fitting safety is arranged between the lower part and the upper part, and - wherein the fitting safety has at least one locking element which fixes the handle in at least one distinguished rotational position, and which can be released from its locking against a restoring force via at least one actuating element, wherein each locking element is formed on a slider which can be moved parallel to the stop surface of the window or the door and engages with a latching disc which is connected to the handle neck of the handle in an axially fixed and rotationally fixed manner, characterized in that a locking disc is arranged between the lower part and the upper part, which has a central recess of the same shape as the polygon, and that the slider is slidably stored in a bracket and can be actuated against a restoring force via the actuating element, wherein the locking disc of the actuating handle and the detent disc of the fitting safety being arranged concentrically to the axis of rotation of the handle neck.