R.A.V. v. City of St. Paul, 505 U.S. 377 (1992), is a case of the United States Supreme Court that unanimously struck down St. Paul's Bias-Motivated Crime Ordinance and reversed the conviction of a teenager, referred to in court documents only as R.A.V., for burning a cross on the lawn of an African-American family since the ordinance was held to violate the First Amendment's protection of freedom of speech. The Court reasoned that an ordinance like this constitutes "viewpoint discrimination" which may have the effect of driving certain ideas from the marketplace of ideas.

Freedom of speech is a principle that supports the freedom of an individual or a community to articulate their opinions and ideas without fear of retaliation, censorship, or legal sanction. The right to freedom of expression has been recognised as a human right in the Universal Declaration of Human Rights and international human rights law by the United Nations. Many countries have constitutional law that protects free speech. Terms like free speech, freedom of speech, and freedom of expression are used interchangeably in political discourse. However, in a legal sense, the freedom of expression includes any activity of seeking, receiving, and imparting information or ideas, regardless of the medium used.