The Nair Service Society (NSS) is an organization created for the upliftment and welfare of the Nair community. It is headquartered at Perunna in the town of Changanassery in Kottayam District, Kerala State, India. It was established under the leadership of Mannathu Padmanabhan. The NSS is a three tier organisation with Karayogams at the base level, Taluk Unions at the intermediate level and the Headquarters at the apex level.
The Society owns and manages a large number of educational institutions and hospitals. These include the NSS College of Engineering at Palakkad, NSS Hindu College at Changanassery, NSS College at Pandalam, Mahatma Gandhi College at Thiruvananthapuram, Pazhassi Raja NSS College at Mattanur, Kannur and the Women's College at Niramankara, Thiruvananthapuram. Taking the lead given by Mannath Padmanabhan, expatriate Nairs both in other states of India as well as in countries other than India have formed Nair Service Societies in their states and countries of domicile. Examples are Karnatka Nair Service Society with 21 karayogams in Bangalore, and the Calcutta Nair Service Society in Kolkata. These Societies of Non Kerala origin retain the cultural uniqueness of the Nairs at the same time adapting many practices to the times and country of their adoption. Efforts are on to bring together all Nair groups the world over under an umbrella "International Federation of Nair Societies".