C.I.D. (Crime Investigation Department) is an Indian crime detective television anthology series created by B. P. Singh for Sony Entertainment Television India and Sony Entertainment Television Asia. It stars Shivaji Satam as ACP, Aditya Srivastava and Dayanand Shetty as Senior Inspectors. The location of the series is set in Mumbai, India. Following a pilot episode on 29 April 1997, the series premiered on 21 January 1998 and is the longest running television series in India, having completed eighteen years in 2015.