Benzophenone-3 (BP-3) is a persistent, bioaccumulative, and toxic UV filter extensively used in cosmetic products namely sunscreens, soaps, hair styling products, and more. Its presence in water bodies posed adverse impacts to aquatic ecosystems, thus, an effective BP-3 removal technique is highly sought after. This study explores the photocatalytic degradation of BP-3 using silver-doped zinc oxide (Ag/ZnO) synthesized via the co-precipitation method. Characterization with X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) confirmed the incorporation of Ag metallic form, with no detectable silver oxides. The experiments were conducted with a BP-3 concentration of 2 mg/L and pH 10, examining the effects of catalyst dosage, initial BP-3 concentration, and Ag loading on degradation efficiency. The results revealed that increasing catalyst dosage (up to 1.0 g/L) and initial BP-3 concentration (up to 5 mg/L) enhanced degradation, with the highest efficiency of 93.7% achieved using 3% Ag/ZnO. However, further increases led to reduced performance due to particle agglomeration. The kinetic analysis indicated that the degradation followed pseudo-first-order kinetics, with a rate constant of 0.0622 min−1 observed for 5% Ag/ZnO. These findings highlight the potential of Ag/ZnO as a suitable solution for mitigating environmental contamination from cosmeceutical waste.