<p>The current research is to examine the deformability and flexural behavior of hybrid reinforced concrete beams that combine steel and Glass Fiber Reinforced Polymer (GFRP) bars. While the high strength of the FRP remained intact, and to further enhance its ductility compared to traditional concrete beams using steel reinforcement, short discrete Polyvinyl alcohol (PVA) fibers were added with hybrid reinforcement. A total of twelve distinct types of specimens i.e., concrete beams strengthened with only GFRP bars (GB), only steel bars (SB), and a hybrid combination of steel and GFRP bars (HB), were cast and subjected to a four-point bending test. The test findings include load at first crack, flexural capacity, load-deflection behaviour, moment-curvature behaviour, deformability index, failure stages, and various modes of failure. Owing to the distinct failure modes and deformation characteristics associated with different reinforcement types, various approaches to evaluate ductility and deformability index were examined. A novel method for calculating the deformability index (DI) based on beam curvature, considering both the displacement and load parameters, was proposed. This method yielded significantly higher DI values in comparison to the energy-based approach. The results revealed that HB beams exhibited greater deformability than that of GB beams but less compared to the SB beams. However, hybrid reinforcement combined with PVA fibers substantially improved both flexural and deformability capacity compared to SB and GB specimens. The experimental findings showed that HB beams with and without fibers enhanced flexural capacity by 39%, 15% and 44%, 22%, respectively, for M30 and M70 grade specimens when compared to the control beam (SB). The PVA fiber addition delayed the first crack load by about 56% to 59% in M30 grade and 30% to 45% in M70 grade beams, and enhanced the deformability index up to 120%.</p>