Parameswaran Iyer is an Indian civil servant and development specialist known for his leadership in implementing large-scale public health and sanitation initiatives. As the former Secretary of the Ministry of Drinking Water and Sanitation, he played a pivotal role in the success of the Swachh Bharat Mission, India's flagship sanitation programme aimed at eliminating open defecation. With decades of experience in the Indian Administrative Service (IAS) and international organisations like the World Bank, Iyer has expertise in water supply, sanitation, and rural development. His innovative approach and dedication to public service have made him a key figure in India's development sector.