CsPbBr3, an all-inorganic halide perovskite, has garnered attention as a highly promising material for advanced photocatalysis due to its exceptional optoelectronic properties, including photoluminescence quantum yields, high absorption coefficients, and outstanding charge carrier mobility. Notably, compared to organic–inorganic hybrids, CsPbBr3 exhibits enhanced photocatalytic applications. The innovations of this review lie in its comprehensive analysis of recent breakthroughs in heterojunction engineering, especially on the novel S-scheme heterojunction tailored to boost charge separation and redox ability in CsPbBr3 materials. The material’s performance has been further strengthened by recent developments in bandgap engineering, surface defects, and heterojunction formation, enhancing photocatalytic applications. In this review, the structural properties, synthesis techniques, and optimization strategies for CsPbBr3 photocatalytic materials are examined. Further, particular attention was paid to doping, surface defects, type-II, Z-scheme, and S-scheme heterojunctions. Also, different photocatalytic applications, like pollutant degradation, H2 evolution, and CO2 reduction, are the main objectives. Emphasis is placed on advanced characterization techniques and performance benchmarks to support the material formation, charge migration, and applications. Finally, the review highlights the challenges and prospects of CsPbBr3-based photocatalysts for environmental applications, aiming to achieve high catalytic efficiency. It offers valuable insights into the use of CsPbBr3-based catalysts in photocatalysis applications. © 2025 The Authors
