Most developing countries seldom have possessed hazardous waste incinerators or decomposition technologies for treatment of hazardous waste such as PCB stockpiles, obsolete pesticides and other hazardous waste. For solving this issue, using cement kilns as a hazardous waste management option is gaining increasing favour around the world. The cement industry is an intensive energy consuming industry. Reusing the hazardous waste as the substitution of raw materials, fuel or gypsum during the cement manufacturing process provides an energy and material recovery which could be described as a great example of win-win situation. This chapter discusses the key aspects in hazardous waste management by cement kilns.