This article discusses the place of 'theology' in multi-faith Religious Education (RE) in English schools without a religious affiliation, highlighting reasons for its sometimes taboo-status, particularly since the emergence of Ninian Smart's phenomenological approach to Religious Studies in the late 1960s. The article explores a diversity of definitions of theology within specific professional and ecclesiastical discourses, and recasts recent debates by focusing not on whether theology and theological inquiry should contribute to so-called 'non-confessional' RE, but on how different forms of theology and theological inquiry might do so legitimately. In the process, the article challenges binary oppositions that have traditionally distinguished the disciplines of Theology from Religious Studies, and argues in favour of the application of various forms of theology and theological inquiry within a critical, dialogic and inquiry-led approach to multi-faith RE. What this might mean in practice is discussed with regard to three concepts: positionality, empathy and critique. Ultimately, multi-faith RE is characterised as occupying a liminal space betwixt and between disciplinary, interpretative and methodological perspectives involved in the study of religion(s) and worldview(s).