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Background People from Black African Diaspora Communities (BAFDC) experience poorer health outcomes and are persistently under‐represented in health and care research. There is limited understanding about how to support their greater inclusion and participation. Objectives Explore secondary data providing insights for the co‐development of a realist theory of inclusion and participation for people from BAFDC in health and care research in the United Kingdom. Drawing on these theories, co‐produce a realist review with a diverse range of people from BAFDC. Methods A realist approach underpinned the study. Pawson's five steps to a realist approach were taken to shape the review, identify relevant sources, extract the data and then analyse and synthesise to inform an overarching programme theory. Initial programme theories (IPTs) were developed through context (C), mechanism (M), outcome (O) configurations (CMOCs). Main Results The review identified 43 relevant documents. Synthesis of evidence from the documents resulted in 8 IPTs and 17 CMOCs helping to understand and explain the inclusion and participation of people from BAFDC. Four key thematic clusters emerged: (1) Health and care research as a White space, (2) Trust deficit: the expansiveness of broken trust, (3) Implicit and complicit bias and (4) Processes that affect inclusion and participation. Findings were underpinned by five existing mid‐range theories (MRTs) around central concepts of candidacy, social dominance, networks, narratives and racism that guided analysis and synthesis, supporting conceptualisation of CMOCs. An overarching programme theory was developed. Conclusion The review identifies how the influence of perspectives, attitudes and beliefs held by individuals or groups about people from BAFDC operates in health and care research, resulting in exclusion, lack of trust and deficit thinking. The findings should be used to inform interventions aimed at increasing inclusion and participation of people from BAFDC. Patient or Public Contribution The co‐production group comprised a diverse range of individuals from within the health and care research system with different lived experiences of being Black. They contributed to the entire review process, including the development of initial programme theories and retroductive thinking and interpretation of the evidence. Clinical Trial Registration Not applicable.

IntroductionPeople from Black African Diaspora Communities (BAFDC) experience poorer health outcomes, have many long-term conditions and are persistently under-represented in health and care research. There is limited focus on programmes, or interventions that support inclusion and participation of people from BAFDC in research. Through coproduction, this realist review seeks to provide a programme theory explaining what context and mechanisms may be required, to produce outcomes that facilitate inclusion and participation for people from BAFDC in health and care research, in the UK.Methods and analysisA group of people from BAFDC with lived and professional experience, representing all levels of the health and care research system, will coproduce a realist review with a team of African-Caribbean, white British and white British of Polish origin health and care researchers. They will follow Pawson’s five steps: (1) shaping the scope of the review; (2) searching for evidence; (3) document selection and appraisal; (4) data extraction and (5) data synthesis. The coproduction group will help to map the current landscape, identifying key issues that may inhibit or facilitate inclusion. Data will be extracted, analysed and synthesised following realist logic analysis, identifying and explaining how context and mechanisms are conceptualised in the literature and the types of contextual factors that exist and impact on inclusion and participation. Findings will be reported in accordance with Realist and Meta-narrative Evidence Synthesis Evolving Standards .Ethics and disseminationThe coproduction group will agree an ethical approach considering accountability, responsibility and power dynamics, by establishing a terms of reference, taking a reflexive approach and coproducing an ethical framework. Findings will be disseminated to BAFDC and the research community through arts-based methods, peer-reviewed publications and conference presentations, agreeing a coproduced strategy for dissemination. Ethical review is not required.PROSPERO registration numberCRD42024517124.