A trimmable horizontal stabilizer, which is provided adjacent to the fuselage (10) of an aircraft and has a predetermined aerodynamic profile, and adjacent to which a movable elevator (21) is arranged. The horizontal stabilizer (20) has a load-bearing structure (22) which extends in the span direction and is firmly connected to the fuselage of the aircraft, and movable areas (23, 24) which are connected to the load-bearing structure (22) such that they can move and can be moved independently of the elevator (21) in order to trim the horizontal stabilizer (20) by varying the aerodynamic profile.