The National Democratic Alliance (NDA) is a coalition of political parties in India. It is led by the Bharatiya Janata Party and had 13 constituent parties at the time of its formation in 1998. The convenor of NDA is George Fernandes, and its honorary Chairman is former Prime Minister Atal Bihari Vajpayee. Also representing the alliance are Lal Krishna Advani, who is the Leader of the Opposition in the Lok Sabha; Jaswant Singh, who is Leader of the Opposition in the Rajya Sabha; and Charnjit Singh Atwal, who is the Deputy Speaker in the Lok Sabha.

Structure
Given the tendency of political parties in India to make and break alliances frequently, the National Democratic Alliance does not have a formal governing structure in place, such as an executive board or politburo. It has been up the leaders of the individual parties to make decisions on issues such as seat-sharing in elections, allocation of ministries and the issues that are raised in Parliament. Given the varied ideologies among the parties, there have been many cases of disagreement and split voting among the allies. George Fernandes, who is the NDA convener, was also chosen by the leaders of the individual parties, and not by any electoral vote. He has no fixed tenure.