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Randomized clinical trials have established the efficacy of naltrexone for reducing quantity of alcohol consumption and incidence of relapse to heavy drinking. To evaluate putative treatment mechanisms, human laboratory studies have examined naltrexone's effects on alcohol responses and self‐administration during short‐term medication protocols. Results from these studies are inconsistent and have yet to be examined in aggregate. This meta‐analysis aimed to quantify naltrexone's effects on alcohol self‐administration and craving in the context of placebo‐controlled human laboratory trials. Potential moderators of medication effects were also examined. Meta‐analyses of alcohol self‐administration (k = 9, N = 490) and craving (k = 16, N = 748) confirmed that, under controlled experimental conditions, naltrexone reduces the quantity of consumption (Hedges' g = −.277, SE = .074, 95 percent CI …