Background & Objective. Polycystic ovarian syndrome (PCOS) is the most common reproductive endocrinopathy in women of reproductive age with many associated metabolic symptoms, in particular hyperinsulinemia, insulin resistance, and a high lifetime risk of type 2 diabetes mellitus. e e ects of time-restricted eating on metabolic pro les have been investigated in many endocrinopathies, but there is minimal data for PCOS. Here we explore the potential role of time-restricted eating in the nonpharmacological management of PCOS. Designs & Methods. Medline, CINAHL, EMBASE, Web of Science, and Cochrane Library were searched for controlled trials of e ects of time-restricted eating regimens on insulin levels in patients with PCOS. A further narrative discussion on the time-restricted eating in PCOS was conducted. Results. 2662 papers were identi ed with 37 selected for full-text review and one paper meeting criteria for inclusion. Ramadan fasting was the only time-restricted eating regimen trialled in this population with no strong evidence of a signi cant e ect on insulin levels. Conclusion. As the systematic review retrieved only one study investigating time-restricted eating to reduce insulin in patients with PCOS, there is no evidence to suggest that this intervention is e ective. From the narrative review, based on studies in other patient groups, time-restricted eating could improve insulin resistance in those with PCOS; however, well-designed studies are required before this intervention can be recommended.