The reduction of metals from their oxides is a very important aspect of metals production. The three general processes for reduction are Metallothermic, Carbothermic and Direct Gaseous Reduction. Each type has its advantages and disadvantages. Carbothermic and direct gaseous reduction are similar in that gas-solid reactions with reducing gases control the reduction process. Physical conditions and kinetic parameters associated with reducing gas-solid reduction will be considered. In iron oxide reduction, problems associated with direct reduction processes are many and varied. These will be mentioned in lesser detail to illustrate some of the problems encountered.