Organic pollutants such as fertilizers, oils, fats, pharmaceuticals, and organic dyes pose significant risks to natural water resources, and treated water waste is highly toxic and hazardous. Therefore, it is crucial to remove such materials before their discharge into the environment. Designing technologies to degrade these organic pollutants has been a challenge for scientists and researchers. Various techniques have been employed to address this issue, and photocatalysis has emerged as a promising method due to its unique physicochemical, optical, and electrical properties. This chapter provides an in-depth review of perovskite-based halide photocatalysts, particularly those employed to drive reduction and oxidation reactions under light irradiation with suitable wavelengths. The fundamental photocatalytic mechanisms of metal halide perovskite (MHP)-based photocatalysts, along with their synthesis methods, are summarized. The multifunctional properties of these MHP-based photocatalysts in the degradation of organic pollutants are highlighted by presenting recent studies.