Background <p>Vitamin D deficiency is common among individuals with obesity and metabolic disorders. Evidence on its effect on metabolic markers remains inconclusive. This systematic review and meta-analysis aimed to evaluate the impact of vitamin D supplementation on lipid profile, glycemic control, and anthropometric indices.</p> Methods <p>A comprehensive search of PubMed, Embase, Cochrane Library, Web of Science, and China Knowledge Network was conducted from inception to May 2024. Randomized controlled trials (RCTs) evaluating oral vitamin D supplementation in adults with overweight, obesity, or metabolic disorders were included. Weighted mean differences (WMDs) and 95% confidence intervals (CIs) were calculated using a random-effects model.</p> Results <p>Twenty-five RCTs (30 arms) were included. Overall, vitamin D supplementation did not significantly affect triglycerides (TG), total cholesterol (TC), HDL-C, LDL-C, fasting plasma glucose (FPG), insulin, HOMA-IR, HbA1c, waist circumference (WC), or body weight (<i>p</i> &lt; 0.05). Subgroup analyses showed significant effects in certain populations, such as increased HDL-C in individuals with diabetes and elevated LDL-C in younger adults and males. A significant reduction in BMI was observed after adjusting for publication bias (<i>p</i> &lt; 0.05). Heterogeneity varied across outcomes, and risk of bias was generally low, although some studies had unclear reporting.</p> Conclusion <p>Vitamin D supplementation has limited effects on metabolic and anthropometric markers in adults with obesity or related metabolic disorders. Certain subgroups may benefit, warranting further targeted research.</p>