Daniel Trefler (born 1959) is a Canadian economist who is currently the J. Douglas and Ruth Grant Chair in Competitiveness and Prosperity at the Rotman School of Management, University of Toronto.

[2] Trefler's work has provided academics, policymakers, and business leaders with invaluable observations on economic issues facing Canada and nations worldwide.

His studies have brought deep insights into how international trade can fundamentally alter societal institutions: for example, how changes in the relative power of special interest groups can impact innovation, constitutional arrangements, worker rights, and the distribution of wealth.

His research has been instrumental in the design of trade agreements that promote productivity, innovation, and investment while minimizing harmful effects on workers.

He gives public lectures and seminars across the world, including at Harvard, Princeton, MIT, Stanford, Chicago, Yale, LSE and Peking University.