Reinforced cement concrete cantilever retaining walls are extensively used in infrastructure project in India. A cantilever retaining wall equipped with relief shelves is a structural design featuring the vertical stem wall with horizontal shelves to reduce lateral earth pressure. The results of a limited parametric study carried out to study the effects of providing relief shelves in a cantilever retaining wall using the geotechnical finite element software PLAXIS 3D are presented in this chapter. The height of the retaining wall and the length of relief shelves were varied during the study to analyse their effect on displacements, maximum shear force, and maximum bending moment on the stem and base slab of the retaining wall. The results show that there is a significant reduction in maximum shear force and bending moment in the stem and base slab of the retaining wall as the length of the relief shelves increases. A maximum decrease of 27% in shear force was noted for a retaining wall stem portion when relief shelves of length of 2 m were provided for a 6-m-high retaining wall. A decrease of 71% in the maximum bending moment was noted for the base slab for the same configuration. The optimum relief shelf width for each height was determined after a Multi-Criteria Decision Analysis. The findings suggest that relief shelves can significantly reduce shear forces and bending moments on the stem and base slab without compromising the stability of the retaining wall. The results of the study can be used to improve design practices and provide practical recommendations for engineering applications of retaining walls with relief shelves.