Instead of grouting all cells, partially grouted (PG) masonry shear walls are formed by only grouting the cells containing vertical reinforcement bars. This effectively reduces the materials used and the time of construction. However, the initial stiffness of PG walls is significantly reduced compared to their fully grouted (FG) counterparts, in which all cells are filled with grout. This paper introduces a comparison of the seismic behaviour of FG and a PG reinforced masonry shear walls with boundary elements (RMSW + BEs) tested experimentally. Both walls were tested under similar axial and cyclic loading protocols to restrict the differences for precise comparison. Furthermore, the two walls were tested to represent the height of a 6- story building. Due to the lab limitations, the walls were constructed at representative heights, and the remaining heights were compensated by reversed cyclic moments applied at the top of the walls. The results present the lateral cyclic behaviour of each wall. Although there was a relative increase in the initial stiffness and the ultimate capacity for the FG wall compared to the PG one, which is attributed to the relative increase in the gross area, both walls showed relatively similar behaviour. The two walls experienced high ductilities and significant energy dissipations, during which the walls sustained a sufficient number of cycles after yielding and before collapsing. This demonstrates that the walls’ behaviour is mainly represented by the nature of the wall ends, which are the masonry boundary elements in this study. This study also highlights the effectiveness of PG walls and their potential as a proposed seismic force-resisting system in mid- and high-rise masonry buildings.