In Britain, most non-theists and atheists do not identify themselves as such in explicit terms, yet non-theistic cultural threads are interwoven through everyday discourses. This article calls for more extensive ethnographic engagement with these more diffuse-and therefore less visible and less commonly researched-forms of non-religious culture. Based on exploratory fieldwork conducted in South East England, it draws attention to one set of these indistinct non-religious forms: 'authentic' and 'inauthentic' ambivalent atheist and non-religious self-understandings and self-representations. It demonstrates how these identities may be subjectively meaningful and culturally significant and how they may be simultaneously empowering and disempowering. Scrutiny of ambivalent atheist identities points to complicated dynamics between non-religion and power and the value of attending to poorly or unmarked non-religious cultures through ethnographic work.First and second waves of research into secularism, non-religious atheism, and other non-religious 1 cultures have been biased in their interest toward the organized expressions of these cultures. There are two sensible reasons for this. Firstly, organized non-religion (e.g., humanist associations, identifiable cultural movements like New Atheism, or anti-theist governmental policy) is empirically and theoretically significant, increasingly so in some regards (see Engelke 2015). Secondly, part of this significance relates to the high visibility of these forms. This prominence shapes their impact in society and also makes them readily identifiable as subjects for social research. In all likelihood, however, these organized forms present the 'tip of the iceberg' when it comes to social and cultural expressions of non-religion in contemporary societies. There are, for example, several indications that the number of people involved with overt, Ambivalent Atheist Identities | 21 representational modes of atheism is vastly overshadowed by the number associated with implicit, non-representational modes (Lee, forthcoming).In this article, I consider the scope for ethnographies of non-religion and non-religious atheism beyond the most centralized or codified expressions of these phenomena. Drawing on exploratory fieldwork conducted in South East England, I focus on issues of representation and identity, concentrating on the more ambivalent non-religious identities that are easily lost from view. Like other forms of self-representation, these identifications reveal, enable, and determine subjective experiences. Representation makes something of the self available to multiple audiences, subjecting it to the interpretation and interests of others. The diffuseness of these representations, however, prevents them from being recognized and therefore restricts their direct influence in public discussion and space. At the same time, it prevents others from understanding and interpreting these subjectivities-and from misunderstanding and misinterpreting them. Thus, ambivalent identities are ...