Inclusion Criteria: - Relapsing-remitting multiple sclerosis (RRMS) diagnosis by 2017 revised McDonald criteria at the treatment start - Participant who started treatment with ozanimod for the first time 3 months (+/- 2 weeks) before inclusion, according to European Union (EU) Summary of Product Characteristics (SmPC) and/or Spanish therapeutic positioning report (TPR) recommendation and following routine clinical practice of the participating hospital - Low-to-moderate activity, defined as less than 2 relapses in the previous year before starting the treatment with ozanimod Exclusion Criteria: - Prior exposure to ozanimod or any other disease modifier treatment (DMT) for RRMS before starting treatment with ozanimod subject of this study - Participant who has started ozanimod within a clinical trial Note: Other protocol-defined inclusion/exclusion criteria apply