Abstract: A process for the production of dihydric phenoles by oxidizing diisopropylbenzenes, which comprises oxidizing diisopropylbenzenes with molecular oxygen to obtain a reaction product mixture (A) containing at least diisopropylbenzene dihydroperoxide (DHP) and diisopropylbenzene monocarbinol monohydroperoxide (HHP), supply said product mixture (A) in a form of oily phase as a solution in an aromatic hydrocarbon solvent to an agitation reactor, supplying thereto at the same time, as an aqueous phase, hydrogen peroxide at a feed rate of 1-5 moles per mole of HHP contained in the product mixture and an acid catalyst in an amount sufficient to reach a concentration in the aqueous phase of 10-40% by weight, the concentration of hydrogen peroxide in the aqueous phase being maintained at a value of at least 20% by weight and the weight ratio of the oily phase/aqueous phase being at least 10, causing oxidization of the HHP into DHP by hydrogen peroxide while maintaining the reaction temperature at 30.degree.-60.degree.