real party in interest ruleglossary / REAL-PARTY-IN-INTEREST RULE real-party-in-interest rule. The principle that the person entitled by law to enforce a substantive right should be the one under whose name the action is prosecuted. Fed. R. Civ. P. 17(a). 词条贡献者 译者大智,毕业于一所旨在培养高级翻译专业人才的翻译院校,擅长翻译各种与环境保护相关的法律文件。