Background: World Health Organization report in ۲۰۱۴ indicates a considerable range of alcohol consumption across the world which had a growing trend during last ۵ years. A study on ۵,۲۳۱ students in ۵۷ universities has shown that alcohol consumption became more common than other drugs, and alcohol is in the first rank for repeated usage. In another study in ۲۰۱۰, the prevalence of alcohol use was ۱۵.۱% among high school students in Tehran with predominant use among boys. This study was aimed to estimate the hidden population of alcohol consumer, commissioned by the Bureau of Mental and Social health and Addiction, Ministry of Health of Iran. Methods: In ۲۰۱۲, Iranian Ministry of Health has implemented a national program for estimation of the frequency of alcohol abusers from the hidden and high risk population by an indirect method. The method of network extension, social network measurement and data collection tool were done through questionnaire. Results: The consumption of alcohol is more than other substances in the country and it is estimated to involve ۱,۵۸۳,۷۵۲ individuals. This was observed in all of the provinces and included more than ۲,۰۰۰ individuals per ۱۰۰,۰۰۰ population which consumed alcohol at least once in the past year. In young population, ۱,۰۶۳,۵۵۷ people have consumed alcohol at least once in the previous year, which represents an incidence of ۵%. Consumption in men aged ۱۸ to ۳۰ years is higher than the other age-groups. In terms of geographical separation, Isfahan, Fars, Tehran, Kurdistan, Zanjan, Yazd and Golestan provinces are at a very high risk. Conclusion: Alcohol is a serious health problem in our society. Based on higher rate of consumption in men and younger population, there must be higher attention. Adjusting systems for alcohol screening and treatment policies should be prioritized. In addition, studies to estimate the knowledge, attitude and practice of alcohol abusers are required.