Amirthaa Dairy is a major dairy company based in Tamil Nadu, India. Founded in 1984 by R. Mohanasundaram with an initial investment of ₹750.^[1]

As of 2024, Amirthaa Dairy operates a state-of-the-art facility capable of processing 500,000 litres of milk daily. The company produces a wide range of fresh milk and dairy products, which are distributed across India.^{[citation needed]}

The company is currently led by Dhayalan Mohanasundaram, who serves as the Joint Managing Director.^{[citation needed]} Under his leadership, Amirthaa Dairy has continued to expand its operations and market presence.^{[citation needed]}

In 2024, Amirthaa Dairy reported a turnover of ₹485 crore. The company has set an ambitious target to reach ₹1,000 crore in turnover by 2028.^{[citation needed]}

Amirthaa Dairy supports over 15,000 farmers in its supply chain. The company has also established the "Amirthaa Dairy Employee's Co-operative Thrift and Credit Society" to provide financial assistance to its employees.^{[citation needed]}