Law is conventionally associated with the law of the nation-state. Halliday and Shaffer's seminal work on transnational legal ordering shows, however, that legal ordering occurs transnationally along multiple dimensions. The legal norms that order the understanding and practice of law transcend and permeate the boundaries of nation-states, which can give rise to transnational legal orders (TLOs) that reflect, penetrate, and harness national law and legal institutions. This chapter demonstrates that transnational legal ordering is particularly evident in the law of trusts. The concept of local or national trust law does not adequately capture the global and transnational flow of ideas and institutions that shape the making of modern trust law, as it exhibits variations in legal ordering beyond nationstates. Instead, modern trust law exemplifies the dynamics of TLOs, because modern trust norms are themselves transnational: They often vary in their geographic and substantive legal scope, producing multiplicities of legal orders that invariably transcend, span, and permeate nation-states, including both offshore and onshore jurisdictions, as well as both common law and civil law jurisdictions.This chapter focuses on the processes through which modern trust norms develop and flow across borders to become a substantive body of transnational and comparative trust law. It discusses how the making of modern trust law at the transnational, national, and local levels develops dynamically over time, by reference to two recent * I am grateful to the editors for their helpful comments. The usual caveats apply. Research for this chapter was funded by the RGC General Research Fund - (project number: ). Halliday and Shaffer define a "transnational legal order" as "a collection of formalized legal norms and associated organizations and actors that authoritatively order the understanding and practice of law across national jurisdictions."