Definition
Latin: "the law of the place of the wrong." The doctrine that the law governing a tort or other civil wrong is the law of the jurisdiction where the harmful act or injury occurred. Under lex loci delicti, a court hearing a dispute arising from an out-of-state tort applies the substantive law of the state where the tort was committed, not the law of the forum where the case is being litigated.
The rule operates as a choice-of-law principle: it answers the question of which jurisdiction's law controls when the parties, the conduct, and the forum are spread across multiple states or countries. A driver injured in an accident in State A while traveling from State B sues in State C — under strict lex loci delicti, State A's law governs liability, damages, and defenses, regardless of where the lawsuit is filed.
Note on spelling: The term appears in sources as both lex loci delicti (genitive singular, more technically correct) and lex loci delictus (a common variant). The two forms refer to the same doctrine; researchers will encounter both in case law and treatises and should search accordingly.
Common Confusion
LEX LOCI DELICTI vs. LEX LOCI CONTRACTUS vs. LEX LOCI REI SITAE: These are three distinct branches of the lex loci family. Lex loci contractus governs choice of law for contracts and points to the place of contract formation or performance. Lex loci rei sitae (or rei sitæ) governs real and sometimes personal property and points to the place where the property is located. Lex loci delicti governs tort liability and points to the place of the wrong. Researchers in historical sources will encounter all three in proximity; they are not interchangeable.
LEX LOCI DELICTI vs. PLACE OF INJURY vs. PLACE OF CONDUCT: Even within the tort doctrine, courts have disagreed about what "place of the wrong" means — is it where the defendant acted, or where the plaintiff was harmed? In most poisoning, defective product, or multi-state tort cases, the two diverge. Traditional doctrine generally pointed to the place of injury. The Restatement (Second) of Conflict of Laws moved away from this rigid localization, making the distinction consequential for understanding which era's law a source is applying.
Core Elements
The traditional lex loci delicti rule has three operative components:
1. Identification of the wrong: The court must characterize the claim as a tort (as opposed to contract, property, or other legal category), since lex loci delicti applies only to tortious wrongs.
2. Localization of the tort: The court identifies the jurisdiction where the tort occurred — traditionally the place of the last act necessary to complete the tort, often equated with the place of injury.
3. Application of that jurisdiction's substantive law: The forum applies the foreign jurisdiction's rules on duty, breach, causation, defenses, and damages as though sitting in that jurisdiction, while retaining its own procedural rules.
Why It Matters in Research
Lex loci delicti was the dominant American choice-of-law rule for torts through most of the twentieth century, enshrined in the First Restatement of Conflict of Laws (1934). Researchers reading pre-1970s tort cases involving multi-state facts will find courts applying it as near-automatic doctrine. After the 1960s, a significant majority of states abandoned strict lex loci delicti in favor of more flexible approaches — the most significant of which, the Restatement (Second)'s "most significant relationship" test, reached opposite outcomes in many cases. A source that looks like settled law under the old rule may be effectively overruled by a state's adoption of the modern approach.
Corpus traps: Historical case reporters and digests index multi-state tort cases under lex loci delicti without flagging whether the jurisdiction has since abandoned the rule. Always confirm the current choice-of-law methodology of the relevant jurisdiction before relying on older decisions. Several states — including Alabama, Georgia, Kansas, Maryland, New Mexico, South Carolina, and Virginia — have retained traditional lex loci delicti in whole or substantial part; most others have not.
The doctrine also intersects heavily with the constitutional floor set by the Due Process and Full Faith and Credit Clauses, which limit how far a forum state can deviate from another state's law. Researchers tracing constitutional limits on choice of law will encounter lex loci delicti as the baseline the constitutional cases were testing.
Historical Dictionary Support
Black's Law Dictionary defines lex loci delicti simply as "the law of the place where the crime took place" — a compressed entry that requires unpacking for civil research contexts. The use of "crime" in that definition reflects older usage in which the term was not sharply limited to criminal law; in practice the doctrine's primary operation has always been in civil tort disputes, and researchers should not read "crime" as restricting the principle to criminal proceedings.
Black's entry for the closely related lex loci rei sitae quotes Kent's Commentaries for the proposition that real property is universally regulated by the law of its location — demonstrating that the lex loci family of rules was understood by nineteenth-century commentators as a coherent system of territorial choice-of-law principles, each branch addressing a different category of legal relationship. That systematic framing is useful context: when historical sources invoke lex loci delicti, they are drawing on the same territorialist logic that governed contract and property choice-of-law simultaneously.
What historical dictionaries miss: Black's does not reflect the doctrinal revolution initiated by Babcock v. Jackson (N.Y. 1963) or the adoption of the Restatement (Second), which displaced lex loci delicti in most American jurisdictions. Entries in older editions of Black's, Bouvier's, or Burrill's should be read as describing the law as it stood before that transformation.
Jurisdictional Note
The United States is split. A minority of states continue to apply traditional lex loci delicti; the majority have adopted interest-analysis, the Restatement (Second)'s most-significant-relationship test, or hybrid approaches. In international disputes, the doctrine retains stronger footing in civil law countries and in transnational tort litigation, though it increasingly competes with EU Rome II Regulation principles in European contexts.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Conflict of Laws; Choice of Law in Tort; Restatement of Conflict of Laws