Mayankote Kelath Narayanan (born 1934) commonly referred to as M.K. Narayanan is the current Governor of Indian state West Bengal and was the National Security Advisor (NSA) to the Prime Minister of India until January 2010. He was appointed to this post on January 25, 2005, three weeks after the former NSA, J N Dixit died on January 3, 2005.[1] He offered to resign on 30 November 2008 over the attacks in Mumbai that killed nearly 200 people, but his resignation was not accepted by the Prime Minister Manmohan Singh. He has been heavily criticized in leading up to the Mumbai terrorist’s attacks of his preoccupation with Sri Lanka and the LTTE, instead of India's chief threat Kashmir insurgents and Pakistan.

M. K. Narayanan headed the Intelligence Bureau (IB) from 1987 to 1990, before heading the Joint Intelligence Committee. He became Chief of the IB again in 1991, before retiring in 1992. He was the Special Advisor for Internal Security to the Prime Minister of India since May 2004.

On 24th Jan 2010 he became the governor of West Bengal. He takes over from Gopalkrishna Gandhi who had a few run-ins with the CPM-ruled West Bengal on critical issues like violence in Nandigram and Singur