The hydrogen reduction kinetics of tungsten trioxide (WO₃) was investigated via non-isothermal thermogravimetric analysis. Under the local gas–solid reduction conditions, the particle morphology of tungsten powders was found to be consistent with that of raw material WO₃. The removal of oxygen from tungsten oxide during hydrogen reduction led to the formation of porous structures between the reduced particles, which were obviously different from the polyhedral single-crystal configuration of tungsten powders obtained via chemical vapor deposition. Moreover, the two-stage hydrogen reduction mechanisms of WO₃ under the local gas–solid reduction conditions can be described using the composite autocatalytic function. The activation energies of the first and second stages of the hydrogen reduction of WO₃ were determined to be 121 and 135 kJ/mol, respectively.