Brick masonry is capable of making a sigficant contribution to the lateral load resistance of reinforced concret frame structures, especially in the case of seismic loads. Red bricks are one of the materials commonly used for buiding walls, primarily for exterior cladding, partitions, and aesthetic purposes in low to medium-rise buidings due to their ready availability and good weathet resistance. Unreinforced masonry refers to a configuration of bricks arranged without the use of reinforcements. Computational modelling plays a crusial role in assisting the analysis of brick masonry walls. The analysis was performed using the SAP2000 v22 software. The modelling involved subjecting the structrure to seismic loading from the Pidie Jaya earthquake using Non-Linear Time History (NLTH) analysis. This research focused on modelling a simple building with unreinforced masonry walls, with dimensions of 3 x 3 m and 3 x 4 m, primarily utilizing bricks for the wallsand sloof. Additionally, earthquake records from the Pidie Jaya region were obtained from the GEOFON and EIDA Data Archives website. The research followed the research method standards outlined in SNI 1727-2020 and SNI 1726-2019. The results of this study include maximum joint displacement with displacement ratios of 7.95%, 2.28%, and 1.81%, as well as rotation ratios of 0.92%, 1.31%, and 22.22%. Deformation and maximum stress distribution in the masonry walls were more significant in the simple buiding model with dimensions 0f 3 x 4 m. the acceleration-time curve exhibited a maximum value 0f 0.07333g at 97 seconds and a minimum acceleration 0f -0.06g at 104 seconds.