Much recent work in analytic theology concerned with Trinitarian doctrine has been limited both by: (1) a narrow focus on the apparent inconsistency of the doctrine and (2) little regard for the historical context in which the doctrine developed. This special issue represents an effort to overcome these limitations in two ways. First, following Timothy Pawl’s definition of “Conciliar Christology,” we define “Conciliar Trinitarianism” as the conjunction of claims about the Trinity in the first seven Ecumenical Councils. Rather than speculative attempts at reconciling, say, sentences taken from the Athanasian Creed, or the common parlance of contemporary, Western Christians, the papers in this issue all address specifically Conciliar Trinitarianism. Second, the special issue brings together both analytic philosophers and patristics scholars in a format in which, in several cases, a scholar from one field responds to a scholar from another. We hope that this will help to jump-start some further conversations between scholars in analytic philosophy and in patristics, as we believe both fields can benefit from a deeper mutual engagement in the study of Conciliar Trinitarianism.