Science and Technology cannot develop in isolation. Therefore, international cooperation and assistance are the integral part of S&T development. In order to strengthen scientific cooperation, NAST has established linkages with several important S & T institutions both in formal and informal capacity .

NAST has signed agreement for the scientific collaboration with following science academies and institutions : 

Agrement signed
Third World Academy of Sciences (TWAS)
October 1, 1986
The Royal Swedish Academy of Sciences
March 2, 2001
Korean Academy of Science and Technology
September 24, 2003
Chinese Academy of Sciences
March 24, 2004
Indian National Science Academy (INSA), India
October 20, 2002
Hungarian Academy of Sciences
November 9, 2003
Council for Scientific and Industrial Research (CSIR), India
October 24, 2002
Consiglio Nazionale della Recerche (CNR), Italy
Institute de la Recherche Agronomique (INRA), France
May 14, 2001
University of Freiburg, Germany
October 10, 2001
University of Zurich, Switzerland
May, 19, 2003
University of Tokyo, Japan
July 28, 1999
Natural History Museum, UK
July 9, 1999
Royal Botanical Garden, Edinburgh
July 9, 1999
The Academy of Sciences of Iran
September 25, 2003
The Bangladesh Academy of Sciences
March 24, 2004
National Council of Science Museums, Kolkata , India
June 26, 2002
Institute of Microbial Technology, Chandigarh, India
February 12, 1997
Central Drug Research Institute, Lucknow, India
February 14, 1997
Asian Institute of Technology (AIT), Thailand
February 9, 2004
The University of Strthclyde, UK
April 30, 1999
King Mongkut's University of Technology Thonburi (KMUTT),Thailand February 23, 2009
National Science and Technology Development Agency (NSTDA), Thailand August 3, 2009
Academia Sinica, Taiwan August 6, 2009

NAST is also a member of following regional and international scientific organizations:
- International Council of Scientific Unions (ICSU).
- International Foundations of Sciences (IFS).
- International Atomic Energy Agency (IAEA).
- Federation of Asian Scientific Academies and Societies (FASAS).
- Information Network on New and Renewable Energy Resources and Technology for Asia and the Pacific (INNERTAP)
- Center for Science and Technology of Non-Aligned Countries ( NAM )
- Association for Science Cooperation in Asia (ASCA)
- Science and Technology Policy Asian Network (STEPAN)
- Association of Asia 's Scientific Academies (AASA)
- International Development Research Center (IDRC)