This research guide introduces scholars to the field of Reformed theology, focusing on works of the twentieth and twenty-first centuries in the English language. After a brief introductory section on the debates about what counts as “Reformed theology,” Martha Moore-Keish explores twenty-one major theological themes, with attention to classical as well as current works. The author demonstrates that this stream of Protestantism is both internally diverse and ecumenically interwoven with other Christian families, not just a single clearly defined group set apart from others. In addition, this guide shows that contemporary Reformed theology has been rethinking the doctrines of God, humanity, and their relationship in significant ways that challenge old stereotypes and offer fresh wisdom for our world today.