Background Self-binding directives instruct clinicians to overrule treatment refusal during future severe episodes of illness. These directives are promoted as having the potential to increase autonomy for individuals with severe episodic mental illness. Although lived experience is central to their creation, the views of service users on selfbinding directives have not been investigated substantially. This study aimed to explore whether reasons for endorsement, ambivalence, or rejection given by service users with bipolar disorder can address concerns regarding self-binding directives, decision-making capacity, and human rights.Methods This qualitative study used data from an internet-based survey distributed to the mailing list of the UK charity Bipolar UK, which contained multiple closed and open questions on advance decision making for patients with bipolar disorder. We included participants who reported that they have been diagnosed with bipolar disorder by a professional (doctor or psychiatrist). In a previous study, quantitative analysis of a closed question about self-binding directives had shown endorsement among a high proportion of participants with bipolar disorder who completed the survey. In this study, we did a thematic analysis of responses from those participants who answered a subsequent open question about reasons for their view. Research was done within a multidisciplinary team, including team members with clinical, legal, and ethical expertise, and lived experience of bipolar disorder. Ideas and methods associated with all these areas of expertise were used in the thematic analysis to gain insight into the thoughts of individuals with bipolar disorder about self-binding directives and associated issues.