Parmeshwar Narayan Haksar (4 September 1913 – 25 November 1998) was an Indian bureaucrat and diplomat, best known for his two-year stint as Prime Minister Indira Gandhi's principal secretary (1971–73).
In that role, Haksar was the chief strategist and policy adviser behind his inexperienced prime minister's rise to near-absolute power in the mid-1970s.
After this he was appointed deputy chairman of the Planning Commission and then the first-ever chancellor of New Delhi's Jawaharlal Nehru University.
An advocate of centralisation and socialism, he was a Kashmiri Pandit who became Gandhi's closest confidante in her inner coterie of bureaucrats, the so-called "Kashmiri mafia".
Prior to this, Haksar was a diplomat of the Indian Foreign Service, who served as India's ambassador to Austria and Nigeria.