For centuries, alcohol carries a meaningful role in our society. Its use is commonly associated with social interaction, conviviality and pleasure. Nevertheless, alcohol use could generate health and social issues leading to a significant burden to our society. A well-known harmful effect of excessive consumption is alcohol use disorder (AUD), which corresponds to an incapacity to control consumption despite adverse bio-psycho-social consequences. Research have been conducted in order to better understand the risk factors that could lead to alcohol use disorder. Alcohol expectancies correspond to believes about the consequences resulting from one’s consumption and have been widely studied 15-27. The primary aim of this Master project was to investigate the relationship between alcohol expectancies and the severity of alcohol use disorder among young adults admitted in the Emergency Department (ED) with alcohol intoxication. The secondary aim consisted of analyzing whether alternative AUD predictors (sex, age, depression, anxiety) would confound and/or moderate the relationships tested in the primary aim. In order to study these aims, correlations between expectancies and Alcohol Use Disorders Identification Test (AUDIT) score were performed and several linear regression models between expectancies, AUDIT score and alternative AUD predictors were also realized. Results showed a significant correlation between both positive and negative expectancies and AUD severity. Effect size were small to moderate. Resulted demonstrated that as positive and negative alcohol expectancies increased, AUDIT score also increased. Furthermore, alternative AUD predictors (age, sex, and depression) were found to significantly predict AUD severity, but did not confound expectancies effects (i.e., positive and negative expectancies were still independently related to AUD in multivariate analysis). Finally, results did not demonstrate any significant interaction between alcohol expectancies and alternative AUD variables for AUD severity prediction. These results provide useful insights into the understanding of AUD and have potential clinical implications. Through motivational interviews targeting alcohol expectancies, it could be possible to adapt what the drinker expects from his consumption and prevent or treat alcohol use disorder and dependence at an early stage.