The Wheeler–Lea Act of 1938 is a United States federal law that amended Section 5 of the 1914 Federal Trade Commission Act to proscribe "unfair or deceptive acts or practices" as well as "unfair methods of competition." It provided civil penalties for violations of Section 5 orders.
Until this amendment was passed, the Federal Trade Commission could only restrict practices that were unfair to competitors. This broadened the FTC's powers to include protection for consumers from false advertising practices.