An interior body trim arrangement is basically provided with an interior body trim panel and a back closure member. The interior body trim panel has an interior facing surface and an outboard facing surface opposite the interior facing surface. The back closure member is fixed to the outboard facing surface of the interior body trim panel. The inboard facing surface of the back closure member and the outboard facing surface of the interior body trim panel define an integrated HVAC duct having a first opening end and a second open end.