Bent Flyvbjerg is a Danish economic geographer. He is Professor of Major Programme Management at Oxford University's Saïd Business School and the founding Director of the University's BT Centre for Major Programme Management. He was previously Professor of Planning at Aalborg University, Denmark and Chair of Infrastructure Policy and Planning at Delft University of Technology, The Netherlands.
Flyvbjerg is the author or editor of 10 books and more than 200 papers in professional journals and edited volumes. His publications have been translated into 19 languages. His research has been covered by Science, The Economist, The New York Times, The Wall Street Journal, The Financial Times, The BBC, CNN, Charlie Rose, and many other media. 
Flyvbjerg received his Ph.D. in urban geography and planning from Aarhus University, Denmark. He has written extensively about megaprojects, decision making, city management, and philosophy of social science. He has twice held the Fulbright Scholarship. Bent Flyvbjerg was knighted in the Order of the Dannebrog in 2002.
His research has shown that competition between megaprojects and their sponsors creates political and organizational pressures that leads to the consistent overestimating of project benefits and the underestimating of project costs. The best megaprojects do not get implemented, but rather the ones that look best on paper.
- 1998 Rationality and Power: Democracy in Practice, University of Chicago Press (ISBN 0226254518)
- 2001 Making Social Science Matter: Why Social Inquiry Fails and How It Can Succeed Again, Cambridge University Press (ISBN 0-521-77568-X)
- 2003 Megaprojects and Risk: An Anatomy of Ambition. Cambridge University Press (ISBN 0-521-00946-4)
- 2008 Decision-Making on Mega-Projects: Cost-Benefit Analysis, Planning and Innovation, Elgar (ISBN 978-1-84542-737-5)
- 2012 Real Social Science: Applied Phronesis, Cambridge University Press (ISBN 978-0-521-16820-5)
- 2014 Megaproject Planning and Management: Essential Readings, Volumes I-II, Elgar (ISBN 978-1-78100-170-7)
- Krak's Who's Who, Copenhagen, 2008
- Oxford University