Building in areas with a high earthquake risk level requires more attention related to the beam-column joints’ strength, especially where those joints do not have stirrups. Beam-column joints can affect the overall performance of a structure. Due to a high-intensity earthquake load, the beam-column joints can become weak and a critical component. Therefore, strengthening the beam-column joints is necessary to investigate. A widely used strengthening material is carbon fiber-reinforced polymer (CFRP). In this research, four beam-column joints were tested for performance and shear capacity. Two test specimens were used as controls, and the other was strengthened with CFRP sheets. CFRP sheets were installed in a two-sided scheme at the beam and joints. The specimen’s load-drift ratio behavior and crack patterns were analyzed to observe the effect of the CFRP strengthening. The results indicated that installing CFRP on both sides of the beam and joints has better shear capacity for these beam-column joints.