Sivasailam Anantharamakrishnan (1905 – 18 April 1964), affectionately called J, was an Indian industrialist and business tycoon who founded and led the Amalgamations Group of industries from 1945 to 1964.

Anantharamakrishnan is remembered for his successful business practices, efficient management of the labour unions and for triggering the growth of the automobile industry of Chennai which has earned the city the epithet "Detroit of India".

[3] Anantharamakrishnan joined Simpsons Group, a British-owned South Indian business conglomerate as Secretary in 1935.

[3] Anantharamakrishnan's induction marked the partial Indianization of Simpsons group which was, till then, completely owned by Europeans.

[10] According to popular Chennai historian S. Muthiah, the successful takeover was the result of an overheard conversation at a Hotel Connemara.

[13][14] A former employee, in an interview, recounted that Anantharamakrishnan was strongly against the use of political lobbying in order to secure business interests.

A book on Anantharamakrishnan was released during his birth centenary on 12 November 2005 by former Supreme Court of India judge Ratnavel Pandian in the presence of his sons, A. Sivasailam and A.