The use of Shape Memory Alloys (SMAs) in seismic strengthening has gained interest due to their unique superelastic properties. This study experimentally investigates the efficiency of SMA strips in enhancing the seismic performance of reinforced concrete columns under cyclic lateral loading, with a focus on slender columns and the effect of strip spacing on load-carrying and deformation behaviour. Three circular reinforced concrete column specimens of 200 mm diameter with 2200 mm height were tested under displacement-controlled cyclic lateral loading using an actuator. One specimen served as a control, while the others were strengthened using pre-tensioned Shape Memory Alloy (SMA) strips with 100 mm and 150 mm spacing, respectively. The setup evaluated the influence of SMA strip spacing on seismic performance, focusing on load-carrying capacity and deformation behaviour. The SMA-strengthened specimens showed a slight increase in lateral load capacity compared to the control, though not significantly. Cracks were concentrated near the base. Due to test setup limitations, the drift was restricted to 4.0%, preventing clear observation of energy dissipation. Results showed that the RC column strengthened with Fe-SMA strips has improved its lateral load carrying capacity and yielded more controlled failure mode when compared to the control column. Thus, Fe-SMA is deemed to be a promising strengthening material that can enhance overall performance of RC columns subjected to cyclic loading.