Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024), is a landmark decision[1] of the United States Supreme Court in the field of administrative law, the law governing regulatory agencies. Together with its companion case, Relentless, Inc. v. Department of Commerce, it overruled the principle of Chevron deference established in Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc. (1984), which had directed courts to defer to an agency’s reasonable interpretation of an ambiguity in a law that the agency enforces.

In lieu of Chevron, the decision assigns the determination of congressional ambiguity to the judicial branch, with executive agency expertise still to be considered under the weaker Skidmore deference. Existing rules and case law already decided under Chevron deference were to remain in place from this decision.