This is a rapid review of the evidence on fasting in Ramadan undertaken by the British Islamic Medical Association (BIMA) in light of the COVID-19 pandemic. This work has not been through a formal consultation process. Rapid peer review was obtained for each topic area following methodological support from Healthcare Improvement Scotland; it should not replace individual clinical judgements and the sources cited should be checked. It does not form a directive and should be used by individuals to frame an informed discussion with their clinicians. The views expressed represent the views of the author(s) and not necessarily those of BIMA, and are not a substitute for professional advice.