ABO₃ perovskite nanoparticles have gained significant attention as efficient photocatalysts due to their versatile electronic properties, tunable band gaps, and high catalytic activity, making them ideal for environmental remediation and clean energy applications. This review provides a comprehensive overview of the recent progress in the photocatalytic applications of ABO₃ perovskites. Key advancements include doping strategies, defect engineering, and the development of heterostructures to enhance visible light absorption, charge carrier separation, and photocatalytic efficiency. Despite these improvements, challenges such as material stability, rapid charge carrier recombination, and scalability issues remain. Sustainable synthesis methods and environmentally friendly material choices are critical to overcoming these obstacles. Looking ahead, continued research into advanced material design and green production techniques is necessary to fully unlock the potential of ABO₃ perovskite nanoparticles for large-scale photocatalytic applications in areas such as water purification, pollutant degradation, and hydrogen production.