The All India Trade Union Congress (AITUC) is the oldest trade union federation in India. It is associated with the Communist Party of India. According to provisional statistics from the Ministry of Labour, AITUC had a membership of 14.2 million in 2013. It was founded on 31 October 1920 with Lala Lajpat Rai as its first president.

Trade unions in India are registered and file annual returns under the Trade Union Act (1926). Statistics on trade unions are collected annually by the Labour Bureau of the Ministry of Labour, Government of India. As per the latest data, released for 2012, there were 16,154 trade unions which had a combined membership of 9.18 million. The trade union movement in India is largely divided along political lines and follows a pre-Independence pattern of overlapping interactions between political parties and unions. The net result of this type of system is debated as it has both advantages and disadvantages. According to the data submitted by various trade unions to the Ministry of Labour and Employment as part of a survey, INTUC with a combined membership of 33.3 million, has emerged as the largest trade union in India as of 2013.