Is the existence of trusts law within Anglo-American law justified? The literature to date does not provide a satisfactory answer. Situating the doctrinal features of trusts law within the liberal tradition of political morality, this Article suggests that trusts law is justified because it enhances personal autonomy in a unique way. It is comprehensively autonomy-enhancing, with express, constructive, and resulting trusts each playing a unique role in achieving this aim. Thus, the law provides a facility for property owners to unilaterally deal with their own property (express trusts), allows individuals the freedom to enlist others in their pursuit of their goals (agreement-based constructive trusts), and ensures that only conclusive choices have long-lasting legal effects (Re Rose constructive trusts and resulting trusts).