John Wesley’s Doctrine of Justification provides updated scholarship on this pivotal doctrine of Methodism, providing a deeper understanding of a major tenet of the Christian faith. Mark Olson offers a comprehensive treatment of the development and exposition of Wesley’s doctrine of justification and how it changed throughout Wesley’s life, including his early views rooted in Anglican heritage, the significant developments in Wesley’s career, and contributions from notable figures like John Fletcher to his doctrine of general justification. The doctrine of justification was pivotal to John Wesley’s understanding of a person’s relationship with God. In Wesley’s view, it defined one of the two general parts of salvation. It touched every aspect of the spiritual journey from birth (general justification) to conversion (present justification) to final judgment and glory (final justification). To properly understand Wesley’s via salutis and theology, one needs to grasp the particulars of his doctrine of justification. The best way to do this is to tell the story of how he came to understand the doctrine over the course of his life. It is a complex story, with many twists and turns, that deserves to be fully told.