This introduction draws on the breadth of the Christian tradition to present a biblically grounded, globally informed, and conceptually precise account of the doctrine of the Trinity. It covers key themes and concepts, offering an alternative to introductory texts on the Trinity that are arranged historically/chronologically. The book incorporates majority world theology, engages important debates in contemporary biblical studies, and draws on neglected historical figures. It also contains a glossary of trinitarian terms and an annotated bibliography of major works on the doctrine of God.