Michael H. Riordan (born 1951) is an American economics professor. He is known for contributions to microeconomics and industrial organization.
Riordan received a B.S. in International Relations from Georgetown University in 1973, an M.A. in Economics (with distinction) from the University of Essex in 1975, and a Ph.D. in Economics from the University of California at Berkeley in 1981, working under the supervision of Richard J. Gilbert.
Riordan is the Laurans A. and Arlene Mendelson Professor of Economics at Columbia University, a position he has held since 2008. He previously taught at the University of Pennsylvania, Stanford University, and Boston University. He has published over 60 papers in specialized economics journals. Several of these have been widely cited and reprinted in various scholarly collections.
Riordan served as co-editor of the RAND Journal of Economics, was a member of the editorial board of the American Economic Review, and associate editor of the Quarterly Journal of Economics. He served as Chief Economist of the Federal Communications Commission and as Economic Advisor at the Federal Trade Commission.
Riordan was a National Fellow at Stanford University's Hoover Institution from 1986 to 1987. In 1994, he was elected Fellow of the Econometric Society.