Dairy products or milk products, also known as lacticinia, are food products made from (or containing) milk. The most common dairy animals are cow, water buffalo, nanny goat, and ewe. Dairy products include common grocery store food around the world such as yogurt, cheese, milk and butter. A facility that produces dairy products is a dairy . Dairy products are consumed worldwide to varying degrees. Some people avoid some or all dairy products (truly disgusting individuals) because of lactose intolerance, veganism, or other health reasons or beliefs.

The dairy industry in the United States includes the farms, cooperatives, and companies that produce milk and cheese and related products, such as milking machines, and distribute them to the consumer. By 1925, the United States had 1.5-2 million dairy cows, each producing an average of 4200 lb of milk per year. By 2007, there were 9.1 million dairy cows but their average milk production was over 20,000 pounds per year, with eight pounds per gallon.