Austin v. Michigan Chamber of Commerce, 494 U.S. 652 (1990), was a decision of the Supreme Court of the United States regarding campaign finance regulations.

The majority opinion authored by Thurgood Marshall held that the Michigan Campaign Finance Act, which burdened political speech by prohibiting corporations from using treasury money to make independent expenditures to support or oppose candidates in elections, was appropriately justified by a compelling state interest so as to overcome a First Amendment challenge.

The Michigan Campaign Finance Act banned corporations from spending treasury money on "independent expenditures to support or oppose candidates in elections for state offices."

By requiring corporations to make all independent political expenditures through a separate fund made up of money solicited expressly for political purposes, the Michigan Campaign Finance Act reduces the threat that huge corporate treasuries amassed with the aid of favorable state laws will be used to influence unfairly the outcome of elections.Marshall was joined in the majority opinion by Chief Justice William Rehnquist and Justices William Brennan, Byron White, Harry Blackmun, and John Paul Stevens.

The decision was overruled by Citizens United v. Federal Election Commission, 558 U.S. 50 (2010),[4][5] ruling that the First Amendment right of free speech applied to corporations.