Republic of Austria v. Altmann, 541 U.S. 677 (2004), was a case in which the Supreme Court of the United States held that the Foreign Sovereign Immunities Act, or FSIA, applies retroactively. It is one of the most recent cases that deals with the "anti-retroactivity doctrine", which is a doctrine that holds that courts should not construe a statute to apply retroactively (to apply to situations that arose before it was enacted) unless there is a clear statutory intent that it should do so. This means that, regarding lawsuits filed after its enactment, the FSIA standards of sovereign immunity and its exceptions apply even to conduct that took place before 1976.