Subrogation is an element of insurance law. In 1944, the United States Supreme Court determined that “insurance” is a form of interstate commerce subject to federal regulation; see United States v. South- Eastern Underwriters Assoc., 322 U.S. 533 (1944). Shortly thereafter, Congress passed the McCarran- Ferguson Act, 15 U.S.C.S. § 1011 and following. The McCarran-Ferguson Act granted authority to the states to regulate the “business of insurance.” Various federal laws continued to govern the “peripherals of the industry (labor, tax, securities).” State laws which regulated the core nature of the insurance business therefore overrode most federal laws to the contrary. This presentation is designed to analyze the myriad of state and federal statutes and cases on the topic of subrogation, from the standpoint of the plaintiff’s personal injury practitioner.