The integrated steel industry is regarded as one of the major industrial sectors, as its products are used in engineering, construction, defense, medical, and scientific equipment. Over 70% of crude steel produced across the globe is produced in blast furnaces that employ coke to generate heat for smelting and to reduce iron oxides in ores. The operation of the coke oven plant produces effluent that contains harmful substances like nitrogenous heterocyclic hydrocarbons, phenolic compounds, ammonia, cyanides, naphthalene, thiocyanate, and polycyclic aromatic hydrocarbons (PAHs). These features and certain carcinogenic chemicals mean that effluents must be adequately treated before being disposed of. Activated sludge, chemical neutralization, and sand filtering are the usual methods to handle coke oven effluent; however, these methods do not meet the current disposal requirements. Advanced oxidation processes (AOPs) are efficient pollutant mineralization techniques that are gaining popularity. Among AOPs, Fenton oxidation is a more reliable treatment method. Depending on the state of the catalyst and reaction conditions, many modifications are possible in Fenton chemistry. Hence, the present study aims to select the best Fenton treatment among the homogeneous, modified homogeneous, and heterogeneous processes for coking wastewater considering multiple criteria such as dose of oxidant and catalyst required, reaction efficiency, and time. This objective is achieved with the help of the multi-criteria decision-making (MCDM) technique, i.e., Preference Ranking Organization Method for Enrichment of Evaluations (PROMETHEE) II, which is one of the most effective approaches for helping to assess the criteria in both qualitative and quantitative contexts.