Abstract: An improved corner guard for use on a pre-hung door assembly. The corner guard of the present invention is designed for use with a pre-hung door assembly that includes a door secured within a three-sided door frame in which the two vertical frame members extend in an offset manner below the bottom edge of the pre-hung door. In a preferred embodiment, the corner guard includes a bumper member for imposing a gap between adjacent stacked assemblies. A substantially flat transition flange member is attached to one end of the base of the bumper member, and together, the transition flange member and bumper member base form a retention barrier surface across the front corner region of the pre-hung door assembly to maintain the door securely seated within the door frame. A fixed side flange is affixed to the other end of the bumper member and extends approximately perpendicularly with respect to the bumper member base surface such that a right angle inner surface corner contour is formed therebetween.