Impulsivity is often found to be related to alcohol use (Pearson and Henson, 2012; Simons, 2003). Additionally, a correlate of alcohol expectancies is increased alcohol use (Hull and Bond, 1986). However, no research to date has looked directly into the association of impulsivity, alcohol expectancies, and alcohol use. Therefore, the present study looks into impulsivity, alcohol use, and alcohol expectancies in high school seniors (N = 3,352, 56.6% Female) from Washington and Sweden. Participants completed a baseline online survey as part of a larger trial that assessed peak blood alcohol content (BAC) in the past 12 months, impulsivity as measured by the sensation seeking scale (Zuckerman, 1964), and alcohol expectancies as measured by the brief Comprehensive Effects of Alcohol questionnaire which consists of positive (sociability, tension-reduction, liquid courage, and sexuality) and negative (cognitive/behavioral impairment, risk/aggression, and self-perception) classifications (CEOA; Fromme, 1993). Regression analyses revealed a significant main effect of impulsivity, cognitive/behavioral impairment, sociability, risk/aggression, and self-perception onto peak BAC (p < .05). However, significant interactions were only found for impulsivity onto risk/aggression and self-perception. A significant moderating effect of risk/aggression onto the relationship between impulsivity and peak BAC (β = .002, F (3, 2913) = 114.71, p < .05) was found such that those with lower impulsivity and lower risk aggression scores (alcohol seen positively) have higher peak BAC. A significant moderating effect of self-perception onto the relationship between impulsivity and peak BAC was also found (β = .001, F (3, 2908) = 132.04, p < .05) suggesting that individuals with lower self-perception scores (alcohol seen positively) and higher impulsivity have higher peak BAC. These results suggest that individuals who are both highly impulsive and have higher positive expectancies for alcohol drink more. Future research should continue to investigate the relationship between alcohol expectancies and impulsivity in vivo.