Membrane filtration in dairy industries is a pressure-driven separation process used to concentrate, purify, or fractionate milk components based on molecular size. Milk is pumped across semi-permeable membranes (such as microfiltration, ultrafiltration, nanofiltration, or reverse osmosis). Smaller molecules like water, lactose, and minerals pass through the membrane as permeate, while larger components such as fat globules, proteins (casein and whey proteins), and microorganisms are retained as retentate. This technology enables standardization of protein content, production of whey protein concentrates, lactose reduction, bacterial removal, and extension of shelf life—without significant heat treatment, thereby preserving nutritional and sensory quality. Membrane filtration in dairy Dairy processing technology Microfiltration in milk Ultrafiltration in whey protein Nanofiltration in dairy industry Reverse osmosis milk processing Milk protein concentration Whey protein isolate production Lactose removal in dairy Dairy water recovery technology Bacteria removal from milk Dairy industry innovations Sustainable dairy processing Dairy product quality improvement