Rayid, short for Rayid Iris Interpretation, is a holistic health practice that claims that behavioral, communication and relationship patterns can be identified according to the structural constitution of the iris of the eye. Rayid is form of iridology. According to Rayid proponents, the pattern of markings within a patient's eyes can be correlated to personality traits.

Rayid has only been practiced for 15 years, and there are only a handful of practitioners. Virtually no scientific studies have been performed to demonstrate any of the conclusions of Rayid proponents. Critics believe there is no scientific basis for any of the conclusions espoused by Rayid proponents.