M. Arunachalam is a Hong Kong-based businessman. M. Arunachalam has played an important role in promoting trade and investment between Hong Kong and India as also between China and India. M. Arunachalam has held the post of chairman, Indian Chambers of Commerce and president of the Asia Pacific Indian Chambers of Commerce and Industry. M. Arunachalam has been part of several delegations of Indian and Chinese businessmen to India. He has also hosted several delegations from India.

M. Arunachalam was a member of the Trade and Industry Advisory Board, Hong Kong. M. Arunachalam has been continuously promoting Indian culture in Hong Kong by organizing performances of artists from India. In his capacity as a responsible businessman, M. Arunachalam has been liberally contributing to various organizations in India. Arunachalam is recognized for enhancing the image and understanding of India in Hong Kong and the adjoining regions.