Abstract: A lid positioning device for a grill having a hinged lid comprises an upper mount for attachment to a sidewall of the grill lid, a lower mount for attachment to a corresponding sidewall of the firebox, and an elongated support member adjustably connected to the upper and lower mounts for movement in a plane substantially parallel to the sidewalls. The support member rotates about a fixed pivot connection to one of the mounts, and its active length is adjustable by engaging a selected one of a plurality of spaced detent slots of the support member with a protrusion on the other mount. Alternatively, a single longitudinal slot is provide in the support member through which the protrusion passes, and a screw clamp mating with the protrusion acts to clamp the support member in a selected adjustment position.