Abstract: A truck bed winch mount assembly provides a mount for a winch in the truck bed of a pickup truck to allow the winch to pull objects into the truck bed. The assembly includes a back rack that has two legs that are joined by upper and lower horizontal cross-members. The back rack attaches to side rails that engage each of the side wall of the truck bed. The winch can be mounted on winch-supporting post that is coupled between a center portion of the upper and lower horizontal cross-members. The side rails have at least two expansion fittings that expand into the stake pockets of the side wall of the truck bed to hold the truck bed winch mount assembly in place. The expansion fittings allow the truck bed winch mount assembly to be easily installed and removed without damaging the integrity of the truck bed. The height of the winch can be adjusted along the winch supporting post.