This chapter presents a comprehensive overview of Minimum Impact Mill Technologies (MIMT) developed to address the environmental challenges of the pulp and paper industry. These technologies span the entire production process—from optimized wood handling and dry debarking to high-yield pulping and extended modified cooking. Advanced washing and bleaching techniques, including oxygen delignification, ozone bleaching, and both ECF and TCF methods, help reduce chemical usage and improve pulp quality. Environmental controls such as electrostatic precipitators, low-NOx burners, and scrubbers on recovery boilers minimize emissions of SO2, NOx, and odorous gases. Energy efficiency is enhanced through increased dry solids in black liquor and improved lime mud washing. Wastewater treatment is addressed through primary, secondary, and tertiary systems, with some mills achieving partial system closure and water reuse. Collectively, these innovations contribute to lower power consumption, reduced pollution, and more sustainable mill operations.