Duncan K. Foley (born June 15, 1942) is an American economist. He is the Leo Model Professor of Economics at the New School for Social Research and an External Professor at the Santa Fe Institute. Previously, he was Associate Professor of Economics at MIT and Stanford, and Professor of Economics at Columbia University (Barnard College and Columbia University Graduate Faculty of Arts and Sciences). He has held visiting professorships at Woodrow Wilson School at Princeton University, UC Berkeley, and Dartmouth College, as well as the New School for Social Research (in 1995, prior to his permanent position starting in 1999).