Abstract: In this study, gas-phase isomerization reaction of m-xylene was studied over various catalysts including Ni, Sn, Pt, Ga, Re or Zr over alumina and zeolite carriers. The catalysts prepared over ZSM-5 carriers and consisted of Ga and/or Pt as active components showed high activity and selectivity on p-xylene compared to o-xylene. Kinetics of the reaction was studied over these selective catalysts and it was found that experimental data were pretty well suited to the kinetic model developed.