The photochemical degradation of neutral red by potassium trisoxalatoferrate (III) has been investigated. The rate of photocatalytic degradation of dye was observed spectrophotometrically. The effect of variation of different parameters like pH, concentrations of complex and dye, amount of light intensity, etc. on the rate of photochemical degradation was also observed. A tentative mechanism for the photochemical oxidative degradation of neutral red has been proposed.