A holster support assembly for use by a user wearing a belt is adjustable for both drop and cant. The assembly includes a belt support that engages and is supported by the user's belt, the belt support defining a plurality of drop positions spaced apart along the track to enable the user to set the drop position of the holster. The assembly also includes a holster mount supported on the belt support for sliding movement relative to the belt support, the holster mount configured for supporting a holster. The holster mount has a first condition in which the holster mount is engaged with the belt support thereby blocking rotation of the holster mount relative to the belt support, and is selectively movable into a second condition in which the holster mount is rotatable relative to the belt support about an axis to enable the user to set the cant position of the holster relative to the belt support.