Surajit Kar Purkayastha (Bengali: সুরজিৎ কর পুরকায়স্থ; born 1 January 1957) is a retired senior Indian Police Service officer of 1985 West Bengal cadre who served as the State Security Advisor of West Bengal from 1 June 2018 to 31 May 2021.

[5] Purkayastha holds a Mechanical engineering degree from Indian Institute of Technology, Kharagpur also completed PGDIT from Indian Institute of Foreign Trade, New Delhi and after completion of his studies he joined Calcutta Electric Supply Corporation.

[5] Purkayastha is an officer of 1985 West Bengal cadre, who completed his Indian Police Service training in Burdwan district.

After that he became the Superintendent of Police of Howrah and then went to Iran as a Research and Analysis Wing (R&AW) officer and stayed there for 5 years.

[5] On 13 February 2013, Purkayastha was appointed as the 36th Police Commissioner of Kolkata replacing Ranjit Kumar Panchananda.