A sliding door assembly for incorporation within a wall, the assembly comprising a sliding door panel, a top rail guide and a bottom rail guide operatively associated with respective top and bottom ends of the sliding door panel to guide the same within a pair of cooperating guide tracks provided within each of the top rail guides and bottom rail guides, the top and bottom rails guides are not vertically interconnected whereby the pairs of cooperating guide tracks extend in a separate plane from that of the wall so that when the sliding door panel is fully opened it is disposed behind the wall. The invention includes a guide track that is bifurcated to provide multiple sliding door panels.