Single session therapy (SST) is a form of psychotherapy that has been researched and practiced internationally since the 1980s. More recently it has been widely employed from the therapeutic modality of narrative therapy - more commonly known as brief narrative single session therapy. Narrative therapy - an internationally practiced psychotherapy in its own right - operates from a blending of social constructionist and Foucauldian/poststructural theory where therapists support clients to co-construct preferred identities amidst powerful discourses which constrain this process. While the co-construction of client-preferred identity is multilayered, studies within this field have historically leaned on social constructionist explanations of how this process occurs at the expense of the Foucauldian/poststructural perspective. This study blends these two perspectives, both conceptually and methodologically, to understand how client-preferred identity co-construction occurs in brief narrative single session therapy. From the social constructionist perspective, the preferred identity that narrative therapy seeks to foreground is viewed as something that is constructed within the session between the client and therapist rather than something that is fully formed prior to the session’s start. Yet, from the Foucauldian/poststructural perspective this process also occurs within the culturally available discourses that are afforded to us. To highlight both perspectives I conducted a hybrid discourse analysis that included a macro-focused Foucauldian discourse analysis and a micro-focused element of discursive psychology, on five appointment-based sessions of brief narrative single session therapy. Immediately following the recording of each session clients and therapists filled out separate post-session questionnaires to share their impressions and experiences of these single sessions. The results of this study present rich examples of how working practitioners trained in brief narrative single session therapy support clients in the co-construction of preferred identities in the context of constraining cultural discourses. In addition, alternative discourses that supported the work of client-preferred identity co-construction based within these sessions, and found within the fields of narrative therapy and the brief therapy movement, were identified. Comments from participant post-session questionnaires offer supplementary perspectives that add greater context to the findings from my analysis of sessions. Implications for the training, practice, and study of brief narrative single session therapy are discussed.