Waste lube oils are classified as hazardous waste due to the metal contents derived from the additives and wear. Most lube oils contain up to 20% of additives including antioxidants, anti-wear, and de-foaming agents which are generally used to extend the usage of lube oils and enhance engines performance. The most widely-used additives are containing metal as they exhibit efficacy in performance enhancement. However, those additives increase the hazardous level of waste lube oils and are highly toxic when released into the environment. Waste lube oils processing is a better option since not only minimize the toxicity and the complexity of waste lube oils, but also may produce the valuable products at the same time, i.e. fuels, solvent, and base oils for production of new lube oils. In this paper, the common technologies for waste lube oils processing, including physical and chemical processes are reviewed. In addition, more recently developed technology such as membrane technologies and their potential application in waste lube oil processing are also discussed.