This study offers a sustained, full-length engagement with the Anglican theologian Oliver O'Donovan. Though it ranges widely, it does so with an especial focus upon O'Donovan's construal of the relationship between eschatology and ethics. Tracing this theme throughout his work, it demonstrates its significance as an area of real tension in his vision of moral theology. Therein opening O'Donovan's thought up to critical analysis, the study places O'Donovan in conversation with a wide set of other thinkers throughout. It registers, comments upon, and assesses his influence upon ethicists writing today, and makes comparative links to other thinkers who serve variously to support, query, and refine his thought as a resource for contemporary theology.