Basanti Dulal Nagchaudhuri

B. D. Nag Chaudhuri
B. D. Nag Chaudhuri (second from left, front row) with Meghnad Saha and others.
3rd Director General of Defence research and development organisation
In office
1970–1974
Preceded bySuri Bhagavantam
Succeeded byMGK Menon
Personal details
Born(1917-09-06)6 September 1917
Narayanganj, Dhaka, Bengal, British India
Died25 June 2006(2006-06-25) (aged 88)
Calcutta, West Bengal, India
EducationBanaras Hindu University
Allahabad University
University of California, Berkeley
Known forBuilding India's first cyclotron
One of the pioneers of nuclear physics in India
AwardsPadma Vibhushan
Organization(s)Indian National Science Academy
International Foundation for Science, Sweden
ITC Sangeet Research Academy
Scientific career
FieldsPhysics
InstitutionsRajabazar Science College
University of Calcutta
Saha Institute of Nuclear Physics
Government of India
Planning Commission
Jawaharlal Nehru University

Basanti Dulal Nag Chaudhuri (6 September 1917 – 25 June 2006) was an Indian Nuclear scientist and academic, and Scientific Advisor to the Ministry of Defence, Government of India. He is known as one of the pioneers of nuclear physics in India. While serving as the Director General (chairman) to the Defence Research and Development Organisation (DRDO), he played influential role in Pokhran-I (Smiling Buddha), India's first successful Nuclear bomb test on 18 May 1974. This historic achievement made India the sixth nation in the world to become a nuclear superpower, after the United States of America, Soviet Union (now Russia), England, France, and China. He also initiated the first feasibility studies on India's ballistic missile program.

In the early 1970s, as the Scientific Advisor to the Ministry of Defence and chair of the Cabinet Committee on Science and Technology, Basanti Dulal Nagchaudhuri played an influential role in Smiling Buddha, India's first nuclear test. He also initiated the first feasibility studies on India's ballistic missile program. Later, he also served as a member of the Planning Commission and as Vice Chancellor of the Jawaharlal Nehru University.