Arun Singh was born on 4 April 1965 in the remote village of Baidha in the district of Mirzapur (U.P).After graduating from Allahabad University in 1984, he moved to Delhi to pursue C.A course. In 1988, he qualified as C. A with all India ranking. He has 25 years' experience as a chartered accountant. He served as a Director of State Bank of India and Union Bank for seven years. Singh has also served as Consultant for World Bank and United Nations projects with large corporations.He has experience as guest faculty in the discipline of management and finance.He has been associated with Rashtriya Swayamsevak Sangh from his early student life.
Arun Singh started his political career as a leader of the Bharatiya Janata Yuva Morcha the youth wing of the Bharatiya Janata Party (BJP). He assumed the office of Vice President and National Treasurer of the youth wing of BJP in 1999-2004.After  that he was the National Convener of Investor Cell. In the meantime,he also served as the National Executive Member of BJP from 2009-2014.