IntroductionGlobally, healthcare regulatory bodies require providers of academic programs to involve service users in the design and delivery of education, yet concrete and tested directions for operationalising this are lacking. Service users' involvement in education is often passive, ad‐hoc and tokenistic, with limited input at the program development level.AimTo explore the co‐design processes and outcomes of a collaborative revision of an Australian post‐registration mental health nursing curriculum.MethodUsing qualitative case study design, the experiences and collaborative practices of five stakeholders (one mental health service user, two carers and two academics) co‐designing a post‐registration mental health nursing curriculum were explored.ResultsCommonly identified barriers to meaningful involvement were overcome through planning and collaborative execution of the group's work. Participants reported a strong sense of successful collaboration in reviewing the curriculum, trusting relationships and mutual respect.DiscussionWhile it was possible to support and augment stakeholder knowledge in the context of post‐registration education, co‐design processes were ultimately bound by the university's relatively inflexible bureaucratic context.Implications for PracticeTo ensure effective stakeholder collaboration beyond classroom teaching, mental health nurse academics must prepare service users for the role, explaining the language and practices of the tertiary health education and nursing context. As part of co‐design processes, organisational mandates must be explored and negotiated, and mutual clarity regarding expectations and roles must be established. A Design Thinking approach can support meaningful engagement of stakeholders in curriculum development.