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 法律翻译Carl,知名法学院法律英语专业,专注翻译各类与复杂商业纠纷有关的法律文件。