Reinforced concrete structures in chloride-rich environments are highly susceptible to steel corrosion, leading to premature deterioration and increased maintenance demands. This study investigates the potential of Bacillus paramycoides, isolated from concrete efflorescence, to enhance the corrosion resistance of fiber-reinforced self-healing concrete. Three natural fibers—coir, flax, and jute—were incorporated to improve the mechanical performance and support bacterial activity. Bacteria were introduced using two techniques: direct addition and immobilization. Corrosion behavior of embedded steel reinforcement was evaluated under chloride-induced conditions using half-cell potential measurements and gravimetric mass-loss analysis. Results showed that bacterial concrete mixes achieved a reduction in steel mass loss ranging from 0.07 to 0.23 % after 270 days compared to control specimens, indicating enhanced corrosion resistance. The synergistic action of bacterial self-healing and natural fibers delayed corrosion initiation and reduced its progression. Furthermore, cost–benefit analysis demonstrated that the proposed bacterial fiber-reinforced concrete provides a durable, economically viable, and sustainable solution for infrastructure exposed to aggressive environments.