In this paper a description of a new integrated process for treatment of contaminants of olive oil mill waste water (OMW) under atmospheric pressure and room temperature. This process involves two main stages. The first stage include pre-ozonation of the raw OMW and primary sedimentation process, followed by electrocoagulation using electrolytic cell supplied with an Iron polls. Then suspended lime solution was added and the solids separated by settling in a precipitating tank. The optimum conditions for the first stage such as pH, current intensity, polls metal species and lime quantity were defined. This stage reduces mainly 58.7% of COD, 86% of total phenols, 69.9% of color and 90.9% of TSS. In the second stage the resulted (OMW) sample driven to an ozone oxidation unit. The oxidation unit include pre-ozonation reactor followed by oxidation process in a Plexiglass rectorin counter verse currents gas liquid phase, then the remaining contaminants was oxidized in advanced catalytic ozonation reactor filled with the catalyst, followed by adsorption on activated carbon column, and the clean disposable water was collected in a storage tank. Optimum conditions for the second stage such as time, ozone dose, pH value and the best catalytic system were determined. Using this integrated wastewater treatment process, OMW can be treated economically and the majority of parameters such as, COD, phenolic compounds, color, turbidity, and TSS can be removed up to 96-100% using the best studied catalyst systems (Fe2O3+ CuO/Clay). The treatment cost of (OMW), is clearly less than any other known and published methods. The obtained …