Abstract: A fire retardant panel door, including a panel door having at least one door panel and stiles and rails. The door panel includes an interior composite section formed by a first plurality of layers of intumescent materials and a first plurality of layers of fire resistant materials disposed between and laminated to a first pair of outer coverings to form a composite laminated door panel. Each of the stiles includes a first core formed of an incombustible material and a second plurality of layers of intumescent materials and a second outer covering to form a composite laminated stile. Each of the rails includes a second core formed of an incombustible material and a third plurality of layers of intumescent materials and a third outer covering to form a composite laminated rail.