| Litigants: | Klaxon Co. v. Stentor Electric Manufacturing Co., Inc. |
| Arguedatea: | May 1 |
| Arguedateb: | 2 |
| Argueyear: | 1941 |
| Decidedate: | June 2 |
| Decideyear: | 1941 |
| Fullname: | Klaxon Company v. Stentor Electric Manufacturing Company, Inc. |
| Usvol: | 313 |
| Uspage: | 487 |
| Parallelcitations: | 61 S. Ct. 1020; 85 L. Ed. 1477; 1941 U.S. LEXIS 1298; 49 U.S.P.Q. (BNA) 515 |
| Majority: | Reed |
| Joinmajority: | unanimous |
Klaxon Company v. Stentor Electric Manufacturing Company, 313 U.S. 487 (1941), was a United States Supreme Court case in which the Court applied the choice-of-law principles of Erie Railroad v. Tompkins to conflicts between laws of different states for cases sitting in federal court on diversity jurisdiction. The court held that a federal court sitting in diversity must apply the choice-of-law doctrine of the forum state to choose between the forum state's law and the other state's law (as distinguished from the federal choice-of-law doctrines which had been used before Erie).[1]