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Background: Low-level laser/LED therapy (LLLT) has been described as a treatment option for alopecia, but no study has comprehensively reviewed its efficacy in multiple alopecia types., Objective: To review and evaluate LLLT for various alopecia types., Materials and Methods: A systematic search of PubMed/MEDLINE, Embase, and CENTRAL was conducted to identify studies assessing the effect of LLLT on patients diagnosed with alopecia. Prespecified outcome measure was the change in hair density. Meta-analysis was performed to calculate the standardized mean difference in hair density before and after LLLT compared with placebo., Results: Thirty-eight studies were included that described 3,098 patients with androgenetic alopecia (2,930/3,098), scarring alopecia (49/3,098), alopecia areata (50/3,098), telogen effluvium (17/3,098), and chemotherapy-induced alopecia (32/3,098). The mean change in hair density increased significantly in androgenetic alopecia patients after LLLT for 4 to 26 weeks compared with placebo (<20 weeks: SMD = 1.14; 95% CI [0.51-1.78]; p = .000; I2 = 88.26%; >20 weeks: SMD = 1.44; 95% CI [0.97-1.91]; p = .000; I2 = 80.81%). Change in hair density was reported in 5 studies evaluating other alopecia types; however, statistical information was insufficient for meta-analysis., Conclusion: LLLT is a promising treatment option for patients with androgenetic alopecia, but future studies are needed to better understand its efficacy in other alopecia types., (Copyright © 2024 by the American Society for Dermatologic Surgery, Inc. Published by Wolters Kluwer Health, Inc. All rights reserved.)