Transnational Public Policy as a Vehicle to Impose Human Rights Obligations in International Investment Arbitration

International investment arbitration has been criticized for its general reluctance to consider human rights concerns related to foreign investors’ activities. By contrast, arbitration tribunals have relied on transnational public policy to prevent a claimant whose investment is tainted with illegality from obtaining redress. This article explores how human rights norms could be conceptualized as part of transnational public policy to impose obligations on foreign investors. It proceeds in three steps. First, it addresses the role of transnational public policy in investment arbitration. Second, the article identifies the material sources considered by tribunals to delimit the content of the doctrine. Third, it focuses on three norms – the protection of fundamental human rights, a corporate responsibility to respect human rights and the right of Indigenous Peoples to be consulted – for which tribunals have found an international consensus and that could be conceptualized as norms of transnational public policy.