Abstract : Masonry structures originated from Europe with a wall thickness of greater than one layer and used mixed pozzolan mortar without a structural skeleton consisting of tied beams and columns. Many historical buildings were able to survive under the dynamic actions of medium earthquakes. The research attempted to carry out dynamic testing based on free vibration to determine the dynamic characteristics of masonry, such as natural frequency and damping ratio. This study aims to understand the characteristics of brick masonry pillars with pozzolanic mortar representing a part of historical building structures compared to brick masonry pillars with a mixture of Portland cement and sand (PC mortar) as used in today's structures. The mortar ingredient for the masonry consisted of red brick powder, lime powder (called 'pozzolan'), sand, and water. The result shows that the brick masonry with the pozzolanic mortar at 90 days has lower stiffness than masonry with the mortar mixture of Portland cement. The brick masonry's natural frequency and damping ratio with the pozzolanic mortar is 17.28 Hz and 2.67%. In contrast, the brick masonry with the mortar mixture of Portland cement was 23.93 Hz and 1.89%.