Polycystic ovary syndrome (PCOS) is a heterogeneous condition that affects women of reproductive age. It is associated with menstrual disturbances, hyperandrogenism, and polycystic ovaries. In addition to this, it results in altered anthropometric parameters, insulin resistance, and subsequently untoward cardio-metabolic sequelae. Therapeutic approaches that target weight loss and improve insulin sensitivity are used to address the metabolic complications in PCOS. Curcumin is a phytochemical which exhibits anti-inflammatory and anti-oxidant properties, and therefore, its use in PCOS has been a subject of substantial interest and research. The aim of this study was to synthesize the existing evidence on the effects of curcumin on glycaemic and lipid parameters in PCOS. We searched PubMed, Embase, Web of Science, Scopus, and ClinicalTrials databases from inception to June 07, 2021. Only randomized controlled trials (RCT) presenting sufficient data on glycemic and lipid parameters in patients with PCOS at baseline and the end of the follow-up period in each group were included. Meta-analysis of five RCTs showed a significant reduction on fasting glucose (WMD: - 3.68 mg/dL, 95% CI: - 5.11, - 2.25, p < 0.00001, I2 = 18%), insulin levels (WMD: - 1.72 µUI/mL, 95% CI: - 2.53, -0.92, p < 0001, I2 = 41%), and HOMA-IR index (WMD: - 0.94, 95% CI: - 1.73, - 0.16, p = 0.02, I2 = 90%) after curcumin therapy. None of the lipid indices were significantly altered by curcumin. Curcumin administration in PCOS resulted in significant improvement in glycaemic parameters; however, no significant changes were seen in lipid parameters with its use.