ABSTRACT: Fiber reinforced polymers (FRP) are newly developed advanced composite materials. The use of FRP in aggressive environments has become a tremendous interest to avoid corrosion. Steel corrosion is considered as the main factor for the insufficient durability of concrete structures, especially in the marine environment. The behavior of fiber-reinforced polymer (FRP) bars under compression is not fully understood yet due to the limited research in this area. Consequently, the main objective of the present work is to explore the structural performance of new hybrid reinforced concrete columns reinforced with the longitudinal reinforcement was in the form of inner steel bars core surrounded with cover of glass fiber polymer (hybrid GFRP-steel). The transverse reinforcement was steel bars with 8 mm diameter. A total of 11 square concrete columns [200 × 200 mm] having a height of 1200 mm were constructed and tested under axial compression loading. The studied parameters were the ratio of inner steel bar area to the gross area hybrid GFRP-steel and the spacing between the stirrups. The test measurements portrayed that the hybrid GFRP-steel columns showed a considerable enhancement in comparison with that reinforced with steel bars. The outcome of the present study can be helpful for the construction industry while employing the corrosion resistant and lightweight hybrid GFRP-steel composite material in concrete columns.