an adjustable hinge comprising : a ) two hinge bodies for attaching respectively to a window or door frame and a window or door leaf ; b ) a revolving pin suitable for mutually articulating the hinge bodies ; c ) a member for adjusting shared positions of the hinge bodies in a direction generally perpendicular to the axis of the pin . the adjustment member includes a sleeve , associated axially with the pin , defining an external lateral coupling surface with a corresponding housing defined in a first of the hinge bodies . the sleeve is pivotally engaged with the housing - such that , while remaining in relatively constant contact with the walls of the cavity during any rotation to change its position , it may occupy substantially any position required along a limited length of the perpendicular adjustment direction . a reversible locking member is also provided for locking the sleeve in positions it occupies inside the housing upon a thrusting action in a defined or selected locking direction . the sleeve has at least three distinct points of contact with the walls of the housing spaced angularly relative to one another . when the locking member is in action , at least two of the distinct points exert a thrusting force , in directions incident to one another , on respective points of the walls so as to accommodate for slack upon coupling between the sleeve and housing in directions generally incident to one another .