This work examines the influence of confinement provided by transverse reinforcement on the ductility and overall structural behavior of over-reinforced concrete beams internally reinforced with glass fiber-reinforced polymer (GFRP) bars. Four beams with identical flexural reinforcement ratios but different transverse reinforcements along the constant moment region were fabricated and tested under a four-point bending configuration. The study revealed that increasing the confinement reinforcement had a significant impact on some structural features of the tested beams, resulting in improved ductility and increased load-bearing capacity. Additionally, closer stirrup spacing contributed to better crack control and more controlled failure. These results suggest that the confinement strategy can lead to superior performance in the ultimate limit state, although only minor effects were observed under service loads. The ductility indices for the tested beams showed that appropriate use of confinement may yield performance similar to that achieved with other alternative strategies reported in the literature, such as using concrete with dispersed fibers and hybrid reinforcement.