Ravindra Kishore Sinha, also known as RK Sinha (22 September 1951) is an Indian billionaire businessman, politician and journalist He is the founder of Security and Intelligence Services, a private security solutions provider in India and Australia

Sinha is a graduate of Political Science and Law and started his career as a journalist. He created Security and Intelligence Services to help retired servicemen after the Indo-Pakistani War of 1971.

Sinha was elected to the Rajya Sabha to represent Bihar State by the Bhartiya Janata Party (BJP) as a Member of Parliament in the Indian Upper House in 2014