Ronald S. Jarmin (born October 31, 1964) is an American economist who served as the acting director of the United States Census Bureau from January 20, 2021, to January 5, 2022.

Since joining the Census Bureau in 1992 he has held various positions including Chief of the Center for Economic Studies, Chief Economist, and Associate Director for Economic Programs.

Jarmin led the team for the 2017 Economic Census,[3] overseeing a move to 100 percent Internet data collection and leveraging enterprise investments to minimize system, application and dissemination costs.

[4] Data products from the Economic Census provide the foundation for key measures of economic performance, including the nation's gross domestic product.

An elected Fellow of the American Statistical Association, he has published papers in the areas of industrial organization, business dynamics, entrepreneurship, technology and firm performance, urban economics, data access and statistical disclosure avoidance.