Abstract: A convertible truck cap for use on a truck bed of a pickup truck is provided. The convertible truck cap includes multiple roof bows, each of which extend upwardly from the truck bed. At least the second roof bow is slidably movable to be positionable between a non-cap use stowed position and a cap use frame position with respect to another roof bow. A plurality of side panels selectively fasten to the roof bows with at least one fastener. At least one roof panel spans the roof bows at a location configured to be above the truck bed.