Seawalls are constructed to defend the shorelines from wave attack. Depending on the ratio of maximum design wave height to the depth of still water at the wall the wave forces acting on the seawall are classified as non-breaking wave force, breaking wave force and broken wave force. Seawall will be subjected to non-breaking wave force, when the depth of water at the wall is greater than 1.5 times the maximum design wave height. In the present analysis a vertical face rigid waterfront retaining wall supporting submerged backfill, and is subjected to non-breaking wave force is considered. Stability analysis has been carried out by considering two cases viz., when wave trough is at the wall, which causes active earth pressure condition, and when wave crest is at the wall, which leads to passive earth pressure condition and the stability is reported in terms of factor of safety against sliding and overturning modes of failures. Sensitivity analysis has been conducted for investigating the effects of different parameters, such as, relative wave height, soil and wall friction angles and height of water on landward side. It is observed that factor of safety against overturning mode of failure decreases by 80% when the ratio of non-breaking wave height to water depth on seaward side changed from 0 to 0.6. The proposed closed form solutions and design charts provide a better guideline for design of seawall subjected to non-breaking waves against sliding and overturning modes of failures.