Abstract: A rear sight, particularly for a pistol, comprises a sight plate carrier and a sight plate, which is mounted in the sight plate carrier and is vertically and laterally adjustable. To provide a rear sight which is structurally simple and has small dimensions, the sight plate carrier is nonadjustably secured to the firearm, particularly at its breech, and is formed with a groove, in which the sight plate is guided for vertical and lateral movements. Two transverse adjusting screws extend from the end faces of the sight plate carrier into the latter and are screwed into the sight plate and serve for a lateral adjustment thereof. A vertical adjusting screw is provided, which crosses the transverse adjusting screws at right angles thereto and is adapted to be screwed into the firearm, particularly at its breech, and has a head, which extends into a slotlike opening formed in the sight plate.