Chassis-cab is a body style and type of construction of commercial vehicles, often used in medium-duty trucks.[1]​.

Instead of supplying the customer with a flatbed, cargo container or other factory pre-assembled equipment the customer receives the vehicle with only "chassis rails" and a "cab". This allows the customer to assemble any desired aftermarket equipment, for example a fire truck, ambulance or recreational vehicle conversion package; which can be customized to the customer's specific needs.

Aftermarket outfitters, including bodybuilders, often make their own packages, which can be ordered for the truck.