Human rights due diligence (HRDD) is a buzzword in business and human rights (BHR) activities. However, multinational corporations (MNCs) often conduct it as a tick-box exercise without transparency. Using a relational contract theory, this article argues that when MNCs contract with local communities through community development agreements (CDAs) to perform HRDD, such contracts are internationalized relational contracts that attract a level of good faith. An established principle in international economic law, good faith serves as a standard for assessing conduct designed to discharge obligations in international contracts between states and MNCs (investor-state contracts). Similar to how investor-state arbitration tribunals use good faith jurisprudence in regulating the relationship between states and MNCs, this article proposes a BHR good faith jurisprudence to prescribe how HRDD obligations should be discharged. The article concludes that a good faith interpretational exercise in BHR would (1) reduce MNCs’ cosmetic compliance with HRDD principles; (2) increase transparency in the HRDD exercise; and (3) become a source of rights for local communities to enforce corporate accountability.