Abstract: A motorcycle wheel disk lock reminder system for reminding a user that a disk lock is mounted to the wheel of the user's motorcycle so that the user does not drive the motorcycle with the disk lock attached to the wheel. The motorcycle wheel disk lock reminder system includes a disk lock adapted for attachment to a wheel of a motorcycle. The disk lock has a slot therein into which an insertion tab outwardly extending from an inner face of a reminder unit is removably inserted. The insertion tab of the reminder unit is also insertable into an ignition keyhole of the motorcycle subsequent removable of the insertion tab from the slot of the disk lock to prevent insertion of an ignition key into the ignition keyhole without prior removal therefrom of the insertion tab of the reminder unit.