The decklid (or boot lid) is the cover over the trunk/boot of motor vehicles that allows access to the main storage or luggage compartment. A hinge allows the decklid to be raised, while devices such as springs hold it up in the open position.

On automobiles with their trunk in the rear, decklids sometimes incorporate a center mounted third brake light (Center High Mount Stop Lamp or CHMSL). A rear decklid may also have a decorative air spoiler.