Embodiments of an expandable drawer organizer for segregating articles within a drawer are disclosed. Each embodiment utilizes at least one tray maintained in slidable agreement with another a tray, providing for the expandable drawer organizer to be varied to approximate the dimensional constraints of the subject drawer. Each embodiment further employs a locking mechanism for securing the associated trays in a user dictated predetermined position. Additional embodiments utilizing various arrangements of an expandable partition that may be arranged in unique configurations within the various trays is also disclosed. Several embodiments having retainers for further limiting the movement of the expandable drawer organizer within the drawer are also presented.