Abstract: A ladder stabilizer attachment device secures a ladder stabilizer to a ladder. The device includes a sleeve including an outer wall. The outer wall has an outer face, an inner face, an upper end, and a lower end. The lower end is open. A slot extends into the inner face from the lower end to receive a top end of a ladder side rail and an uppermost rung of the ladder into the slot. A top edge of the slot defines a stop whereby the stop rests upon the uppermost rung of the ladder. A coupler is mounted to the sleeve. The coupler releasably engages the uppermost rung of the ladder.