The Free Exercise Clause is the second of the two religion clauses in the First Amendment to the United States Constitution, which provides that “Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof.” The clause restricts government action that interferes with religious belief and, within limits, religious practice. It applies to the federal government directly and, since incorporation by the Supreme Court in 1940, to state and local governments through the Fourteenth Amendment. The scope of the protection - particularly whether and when religiously motivated conduct is exempt from laws that apply to everyone - is contested among judges and scholars; see free-exercise-clause-smith-strict-scrutiny-controversy and the viewpoints below.
Free Exercise doctrine distinguishes between religious belief, which receives absolute protection, and religiously motivated conduct, which the Supreme Court has protected to varying degrees over time. Courts evaluating a free exercise claim today generally ask whether a challenged law is neutral and generally applicable, whether it imposes a substantial burden on religious exercise, and, if heightened review applies, whether the government has a compelling interest pursued through the least restrictive means available.
The controlling framework traces to *Employment Division v. Smith* (1990), which held that neutral, generally applicable laws do not violate the Free Exercise Clause even when they incidentally burden religious practice, and that such laws need only survive ordinary rational-basis review. *Smith* replaced the strict-scrutiny approach associated with *Sherbert v. Verner* (1963) for most cases, though Congress responded with the Religious Freedom Restoration Act of 1993, which reimposes strict scrutiny by statute for federal government action.
Since 2020 the Supreme Court has narrowed *Smith*'s practical reach without overruling it outright. In *Fulton v. City of Philadelphia* (2021), the Court found a city's foster-care contracting policy was not “generally applicable” because it allowed for discretionary exemptions, triggering strict scrutiny; three justices urged overruling *Smith* directly, while others said they were not persuaded a workable replacement standard existed. In *303 Creative LLC v. Elenis* (2023), the Court avoided revisiting *Smith* by deciding a closely related dispute on free-speech rather than free-exercise grounds. In *Mahmoud v. Taylor* (2025), the Court held that a school board's introduction of LGBTQ-themed storybooks without a parental opt-out option substantially burdened parents' free exercise rights and was subject to strict scrutiny under the reasoning of *Wisconsin v. Yoder* (1972), again without disturbing *Smith* itself. As of mid-2026, *Smith* remains the governing precedent for most neutral, generally applicable laws, though at least two pending petitions ask the Court to overrule it, and observers differ on whether five justices are prepared to do so. Lower courts continue to apply *Smith* and *Sherbert*-style strict scrutiny inconsistently depending on how a given case is framed.
A separate and longstanding line of cases addresses criminal conduct undertaken for religious reasons; courts have historically distinguished belief (absolutely protected) from action that violates “social duties” or generally accepted criminal prohibitions, as in the 19th-century polygamy cases. For background on the clause's drafting and earlier 20th-century doctrine, see Free Exercise Clause History.