United States v. Arjona

{{Use mdy dates|date=January 2025}}

{{Infobox SCOTUS case

|Litigants=United States v. Arjona

|ArgueDate=

|ArgueYear=

|DecideDate=March 7

|DecideYear=1887

|FullName=

|USVol=120

|USPage=479

|Docket=

|ParallelCitations=

|Prior=

|Subsequent=

|Holding=It is not necessary for Congress to announce that a statute is intended to enforce international criminal law before that statute may be enforced under the Offenses Clause.

|Majority=Waite

|JoinMajority=unanimous

|LawsApplied=Offenses Clause

}}

United States v. Arjona, 120 U.S. 479 (1887), was a United States Supreme Court case in which the court held that it is not necessary for Congress to announce that a statute is intended to enforce international criminal law before that statute may be enforced under the Offenses Clause.{{ussc|name=United States v. Arjona|volume=120|page=479|year=1887}}.{{Cite book |last=Lieberman |first=Jethro K. |title=A Practical Companion to the Constitution |year=1999 |pages=351|chapter=Piracy}}