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Objective To identify factors acting as barriers or enablers to the process of healthcare consent for people with intellectual disability and to understand how to make this process equitable and accessible. Data sources Databases: Embase, MEDLINE, PsychINFO, PubMed, SCOPUS, Web of Science and CINAHL. Additional articles were obtained from an ancestral search and hand- searching three journals. Eligibility criteria Peer- reviewed original research about the consent process for healthcare interventions, published after 1990, involving adult participants with intellectual disability. Synthesis of results Inductive thematic analysis was used to identify factors affecting informed consent. The findings were reviewed by co- researchers with intellectual disability to ensure they reflected lived experiences, and an easy read summary was created. Results Twenty- three studies were included (1999 to 2020), with a mix of qualitative (n=14), quantitative (n=6) and mixed- methods (n=3) studies. Participant numbers ranged from 9 to 604 people (median 21) and included people with intellectual disability, health professionals, carers and support people, and others working with people with intellectual disability. Six themes were identified: (1) health professionals' attitudes and lack of education, (2) inadequate accessible health information, (3) involvement of support people, (4) systemic constraints, (5) person- centred informed consent and (6) effective communication between health professionals and patients. Themes were barriers (themes 1, 2 and 4), enablers (themes 5 and 6) or both (theme 3). Conclusions Multiple reasons contribute to poor consent practices for people with intellectual disability in current health systems. Recommendations include addressing health professionals' attitudes and lack of education in informed consent with clinician training, the coproduction of accessible information resources and further inclusive research into informed consent for people with intellectual disability. PROSPERO registration CRD42021290548. [ABSTRACT FROM AUTHOR]