Abstract: A buckle adjustable for belts of different widths includes a flat rectangular housing open at its top and bottom and a pair of guide members including outer channel shaped tracks and vertical front plates extending through and slidably engaging the housing openings and retained in preselected positions by bowed leaf springs entrapped between the housing front wall and respective slide plates. Belt anchoring vertical tongues project inwardly from the outer trailing ends of the guide members and are rearwardly offset from the tracks and a curved belt eyelet engaging tongue is mounted on the housing rear wall.