Beam-column joints are critical components of reinforced concrete structures under seismic loading. Many existing buildings are vulnerable due to inadequate detailing and poor reinforcement. This study investigates the seismic retrofitting of pre-damaged four-way beam-column joints using carbon fiber-reinforced polymers (CFRP). A single specimen was tested under cyclic loading until complete brittle shear failure at 4.1% drift (control condition, T). The same specimen was then repaired with CFRP sheets on beam and column faces and a continuous CFRP wrap extending 50 cm along the beam on each side of the joint, and retested under the same protocol (retrofitted condition, TR). Quasi-static cyclic testing was conducted to evaluate load-bearing capacity, stiffness, energy dissipation, and failure modes. Results showed that maximum load-bearing capacity increased by 9.2%. The maximum applied displacement changed from 95.3 mm to 85.5 mm, i.e. no increase was observed. Total energy dissipation increased by 44%, and pinching behavior was reduced. CFRP retrofitting shifted the failure mechanism from brittle shear to ductile flexural. The retrofitted specimen performed up to 3.7% drift without severe strength degradation. These findings demonstrate that the combination of CFRP sheets and wraps effectively improve the seismic performance of damaged joints; however, as the results are based on testing a single specimen, broader generalization to other joint configurations requires further study.