Catalytic combustion of chlorobenzene over supported metal oxides has been investigated. TiO₂ was prepared by the sol-gel method from titanium isopropoxide. The supported metal oxide catalysts were prepared by the incipient wetness method and characterized by XRD, FT-Raman spectroscopy, and TPR. Among the supported metal oxides, VO_x supported on TiO₂ had the highest activity for chlorobenzene oxidation; the activities decreased in the order VO_x > CrO_x > FeO_x > MnO_x. In addition, among the vanadium oxide catalysts supported on TiO₂, Al₂O₃ and SiO₂, the titania-supported catalyst (VO_x/TiO₂) had the highest catalytic activity. The VO_x dispersed on the TiO₂ surface acts as the active site of the VO_x/TiO₂ catalysts during the oxidative decomposition of chlorobenzene. When the vanadium loading reached 3 wt%, the total conversion temperature was lowered to 310 ℃. In addition, VO_x supported on TiO₂ calcined at 300 ~ 500 ℃ had a higher activity than that calcined at 600 ~ 700 ℃. This result suggests that the structure of the TiO₂ support has an influence on the catalytic activity of chlorobenzene combustion. The catalytic activity decreases with an increase in the amount of water at a low reaction temperature, but it has a similar activity as that in the absence of water at a high reaction temperature.