Abstract: This study aimed to develop a formal model of peer support for bereaved military families in the United Kingdom (UK) that is co-designed, inclusive, and integrated within the existing bereavement support system, without requiring affiliation with specific associations. The need for such a model was identified through a previous study (McGill et al., 2022), which examined the long-term impact of military bereavement and recommended the development of peer support tailored to the short, medium, and long-term needs of bereaved families. In response, the present research adopted an applied mixed-methods approach, incorporating a systematic narrative review, online survey, expert consultation, and co-production workshops. This iterative, multi-phase process ensured the resulting pilot framework was grounded in the lived experiences of those affected by sudden or traumatic military loss. The findings informed the co-production of an evidence-based peer support model intended to enhance, compliment, and extend the nature and reach of existing bereavement services.