privacy, right of, the right to be left alone without unwarranted intrusion by government, media, or other institutions or individuals. While a consensus supporting the right to privacy has emerged (all recently confirmed Justices to the Supreme Court have affirmed their belief in the right to privacy), the extent of the right, and its basis in constitutional law, remain hotly contested. It was not until the U.S Supreme Court decision in Griswold v. Connecticut (1965), which voided a state statute preventing the use of contraceptives, that the modern doctrine of privacy emerged. In his opinion, Justice William O. Douglas argued that a protection from state intrusion into marital privacy was a constitutional right, one that was a "penumbra" emanating from the specific guarantees of the constitution. The right to sexual privacy as set forth in Griswold was one of the main foundations of the court's decision in Roe v. Wade (1973) to overturn state abortion statutes. Later attempts to extend the right of privacy to consensual homosexual acts in Bowers v. Hardwick (1986) were initially rejected by the court. In 2003, however, the court reversed that decision and rejected all antisodomy laws.

The Privacy Act of 1974 provides for disclosure of, and personal access to, all federal records containing personal information, regulates their transfer to others, and allows for legal remedies in cases of their misuse under the law. The Right to Financial Privacy Act (1978) limits federal access to financial records but places few restrictions on access by states, businesses, and others. The privacy of most other information is not guaranteed. Computer and telecommunications advances have made credit, medical, and other data a readily available, highly marketable commodity, raising many concerns about individuals' privacy. Although the European Union in 1998 severely limited the buying and selling of personal data, these practices have been generally allowed under U.S. law. Limits exist on the federal government's ability to intercept voice and data communications; these are established by law and related to the Constitution's protection against unreasonable searches (see search, right of).

Right of a person to be free from intrusion into matters of a personal nature. Although not explicitly mentioned in the U.S. Constitution, a right to privacy has been held to be implicit in the Bill of Rights, providing protection from unwarranted government intrusion into areas such as marriage and contraception. A person's right to privacy may be overcome by a compelling state interest. In tort law, privacy is a right not to have one's intimate life and affairs exposed to public view or otherwise invaded. Less broad protections of privacy are afforded public officials and others defined by law as “public figures” (e.g., movie stars).

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