The results of a mathematical approach to estimate the shear failure resistance of a geotextile-retained soil wall are presented in this paper. The analytical method used is based on a limiting-equilibrium approach combined with variational extremization, and it satisfies all equilibrium requirements. The analytically derived failure mechanism consists of a log-spiral slip surface and reinforcing geotextile sheets positioned orthogonally to the radii defining it. A closed-form solution is obtained that provides complete insight into the problem's behavior. The results indicate that (a) as the geotextile tensile strength increases, the extent of the critical slip surface increases,(b) as the geotextile strength increases, the compressive stress over the er i tical slip surface also increases,(c) as the geotextile strength increases, the magnitude and extent of tensile normal stress that tends to develop near the top decreases, and (d) when frictional soil is concerned, the strength of the geotextile at the bottom is mobilized the most. The end products are design charts that can easily be applied to a particular problem. The charts indicate that reinforcement may significantly increase the stability of a wall (or slope) depending on the geotextile's tensile strength, the soil's strength properties, and the inclination of the structure face.